1 00:00:03,100 --> 00:00:05,266 TYSON: The kingdom of matter stores it treasures 2 00:00:05,400 --> 00:00:07,033 on my many levels. 3 00:00:07,166 --> 00:00:10,467 Until recently, we thought there was only one. 4 00:00:10,600 --> 00:00:14,266 We had no idea there were others. 5 00:00:16,900 --> 00:00:20,367 When we strike a match, a chemical reaction liberates 6 00:00:20,500 --> 00:00:24,333 energy stored in the molecules. 7 00:00:24,734 --> 00:00:28,934 Old chemical bonds break and new ones are forged. 8 00:00:29,066 --> 00:00:32,133 Now, the adjacent molecules begin to move faster and the 9 00:00:32,266 --> 00:00:35,467 temperature increases. 10 00:00:36,967 --> 00:00:40,266 Soon, the process becomes self-propagated, 11 00:00:40,400 --> 00:00:42,433 a kind of chain reaction. 12 00:00:42,567 --> 00:00:45,667 The energy represented by a flame has been locked, 13 00:00:45,800 --> 00:00:49,700 perhaps for many years, in chemical bonds between atoms. 14 00:00:49,834 --> 00:00:54,300 Mediated by the electrons that revolved around their core. 15 00:00:55,433 --> 00:00:57,100 When we make a fire, 16 00:00:57,233 --> 00:01:01,200 we release this hidden chemical energy. 17 00:01:02,300 --> 00:01:04,600 But there is a deeper level of matter that 18 00:01:04,734 --> 00:01:07,934 houses another kind of energy. 19 00:01:10,500 --> 00:01:14,700 Inside the heart of the atom, its nucleus. 20 00:01:15,467 --> 00:01:19,200 This hidden treasure was forged billions of years ago 21 00:01:19,333 --> 00:01:21,433 in distant stellar furnaces. 22 00:01:21,567 --> 00:01:24,800 Long before Earth was formed. 23 00:01:26,900 --> 00:01:29,867 It's what powers the stars. 24 00:01:30,000 --> 00:01:31,633 Wresting this knowledge from nature 25 00:01:31,767 --> 00:01:35,200 is a cosmic rite of passage. 26 00:01:35,333 --> 00:01:38,367 The beings of any possible world clever enough to travel 27 00:01:38,500 --> 00:01:43,200 this deep into nature's labyrinth better take care. 28 00:01:43,700 --> 00:01:47,700 The secret of starlight is nothing to fool with. 29 00:01:48,166 --> 00:01:50,867 Like fire, it can bring a civilization to life and it 30 00:01:51,066 --> 00:01:53,633 can burn it to the ground. 31 00:01:57,233 --> 00:02:02,967 (theme music plays) 32 00:02:23,433 --> 00:02:29,900 ♪ ♪ 33 00:02:49,834 --> 00:02:55,300 ♪ ♪ 34 00:03:06,900 --> 00:03:09,867 What is an atom? 35 00:03:10,000 --> 00:03:11,900 What are they made of? 36 00:03:12,033 --> 00:03:14,567 How are they joined together? 37 00:03:14,700 --> 00:03:17,000 How could something as small as an atom 38 00:03:17,133 --> 00:03:19,967 contain so much power? 39 00:03:20,100 --> 00:03:23,367 Where do atoms come from? 40 00:03:23,500 --> 00:03:26,033 The same place we do. 41 00:03:26,767 --> 00:03:29,066 When we seek the origin of atoms, 42 00:03:29,200 --> 00:03:32,300 we are searching for our own beginnings. 43 00:03:32,433 --> 00:03:36,900 This quest takes us to the depths of space and time. 44 00:03:37,033 --> 00:03:40,900 I want to tell you a tale of two atoms. 45 00:03:41,033 --> 00:03:43,934 Come with me. 46 00:03:51,867 --> 00:03:54,934 Long ago, before there was an Earth, 47 00:03:55,066 --> 00:03:58,633 there was a wisp of cold thin gas. 48 00:03:58,767 --> 00:04:01,967 It was made of the simplest atoms. 49 00:04:02,100 --> 00:04:05,567 And they were gravitationally attracted to one another. 50 00:04:05,700 --> 00:04:09,066 So, the cloud grew. 51 00:04:12,834 --> 00:04:14,467 The atoms contained small, 52 00:04:14,600 --> 00:04:17,100 but heavy particles in their nuclei. 53 00:04:17,233 --> 00:04:22,233 The hydrogen had protons, the helium had neutrons as well. 54 00:04:22,834 --> 00:04:25,300 They both had a skittering veil of electrons 55 00:04:25,433 --> 00:04:27,133 in orbit around them. 56 00:04:27,266 --> 00:04:30,600 The atoms in the interior of the cloud moved ever faster 57 00:04:30,734 --> 00:04:33,934 as gravity pulled them ever closer together. 58 00:04:34,066 --> 00:04:37,767 Until the whole thing collapsed in on itself. 59 00:04:37,900 --> 00:04:40,900 This collapse raised the temperature so high, 60 00:04:41,033 --> 00:04:44,667 that the cloud became a natural fusion reactor. 61 00:04:48,533 --> 00:04:52,300 In other words, a star. 62 00:04:52,433 --> 00:04:55,533 Atoms operating according to the laws of physics met 63 00:04:55,667 --> 00:04:59,133 and fused in the unbroken darkness. 64 00:05:00,166 --> 00:05:03,467 And then there was light. 65 00:05:03,600 --> 00:05:06,000 In this froth of elementary particles, 66 00:05:06,133 --> 00:05:08,300 the nucleus of one of the atoms, 67 00:05:08,433 --> 00:05:11,700 a helium atom, was formed. 68 00:05:13,834 --> 00:05:17,900 After billions of years, the star is now elderly. 69 00:05:18,033 --> 00:05:22,333 Having converted all of its available hydrogen fuel to helium. 70 00:05:22,467 --> 00:05:25,333 Now that it's time for the star to die, 71 00:05:25,467 --> 00:05:28,967 it resumes the turning inward of its infancy. 72 00:05:34,133 --> 00:05:37,200 Can you find our helium atom? 73 00:05:37,333 --> 00:05:40,300 It joined with two others to become one of our heroes, 74 00:05:40,433 --> 00:05:41,800 a carbon atom. 75 00:05:41,934 --> 00:05:44,133 That's what in the hearts of stars. 76 00:05:44,266 --> 00:05:46,500 Soon, our carbon atom will tumble out of this 77 00:05:46,633 --> 00:05:51,066 red giant star into the interstellar ocean of space. 78 00:05:51,200 --> 00:05:53,467 We've tinted this atom blue so you can find it 79 00:05:53,600 --> 00:05:55,533 in the vastness. 80 00:05:55,667 --> 00:05:59,333 Meanwhile, in another part of the galaxy. 81 00:06:13,033 --> 00:06:15,367 Similar processes were unfolding as stars were 82 00:06:15,500 --> 00:06:17,600 born and died. 83 00:06:17,734 --> 00:06:19,934 The other atom of our tale was formed in the heart 84 00:06:20,066 --> 00:06:22,300 of this dying star. 85 00:06:22,433 --> 00:06:24,800 In the catastrophic process of going supernova, 86 00:06:24,934 --> 00:06:30,100 226 protons and neutrons became fused to a carbon atom. 87 00:06:30,233 --> 00:06:33,433 Turning it into a uranium atom. 88 00:06:33,567 --> 00:06:35,834 We've tinted our other hero atom red, 89 00:06:35,967 --> 00:06:37,533 so that you could follow it on its odyssey 90 00:06:37,667 --> 00:06:41,533 through space and time. 91 00:07:02,767 --> 00:07:04,500 As chance would have it, 92 00:07:04,633 --> 00:07:07,300 after wandering the vast Milky Way galaxy, 93 00:07:07,433 --> 00:07:10,667 our two atoms both happened on the fiery birth 94 00:07:10,800 --> 00:07:13,767 of a small solar system. 95 00:07:13,900 --> 00:07:16,900 Ours. 96 00:07:21,900 --> 00:07:26,467 Our carbon atom has traveled far to become part of a small planet. 97 00:07:28,533 --> 00:07:31,800 After billions of years, it joined an extremely complex 98 00:07:31,934 --> 00:07:35,166 molecule, which has the peculiar property of a making 99 00:07:35,300 --> 00:07:38,934 virtually identical copies of itself. 100 00:07:39,934 --> 00:07:44,000 The carbon atom plays its tiny role in the origin of life. 101 00:07:45,266 --> 00:07:47,333 Through all its incarnations, 102 00:07:47,467 --> 00:07:50,867 our carbon atom has had no self-awareness. 103 00:07:51,066 --> 00:07:52,734 No free will. 104 00:07:52,867 --> 00:07:57,667 It is merely an extremely minor cog in some vast cosmic machinery, 105 00:07:57,800 --> 00:08:01,433 working in accord with the laws of nature. 106 00:08:01,567 --> 00:08:03,133 And that other atom? 107 00:08:03,266 --> 00:08:05,500 The uranium atom made in the supernova? 108 00:08:05,633 --> 00:08:08,400 What has become of it? 109 00:08:12,467 --> 00:08:15,500 Our world was born in fire. 110 00:08:15,633 --> 00:08:18,734 And this tiny atom was drawn to it. 111 00:08:18,867 --> 00:08:22,533 Maybe it rode the explosive wave of a supernova. 112 00:08:22,667 --> 00:08:25,700 Or perhaps, it was attracted by the gravity of our sun and 113 00:08:25,834 --> 00:08:29,367 pulled down deeper and deeper into the interior, 114 00:08:29,500 --> 00:08:32,734 which was even more of a hell. 115 00:08:32,867 --> 00:08:35,166 The Earth's surface soon cooled, 116 00:08:35,300 --> 00:08:38,367 but the interior remained molten. 117 00:08:38,500 --> 00:08:42,233 The magma slowly circulating and our uranium atom found 118 00:08:42,367 --> 00:08:46,867 itself carried over the ages, from the deep interior, 119 00:08:47,000 --> 00:08:50,166 back all the way up to the surface. 120 00:08:50,300 --> 00:08:53,200 Despite the high temperatures and pressures deep within the 121 00:08:53,333 --> 00:08:58,333 Earth, our atom's integrity was never threatened. 122 00:08:59,100 --> 00:09:04,667 Atoms are small, old, hard and durable. 123 00:09:07,934 --> 00:09:11,066 Everything is made of atoms, including us. 124 00:09:11,200 --> 00:09:13,800 But until the last years of the 19th Century, 125 00:09:13,934 --> 00:09:18,000 we didn't know about the frenzied activity inside the atom. 126 00:09:18,133 --> 00:09:21,400 And this is where our two atoms from opposite ends of 127 00:09:21,533 --> 00:09:24,133 the Milky Way galaxy finally met. 128 00:09:24,266 --> 00:09:26,834 It happened in Paris. 129 00:09:33,266 --> 00:09:39,900 ♪ ♪ 130 00:09:46,266 --> 00:09:49,700 TYSON: Our carbon atom became part of the retina of one of 131 00:09:49,834 --> 00:09:54,000 the world's greatest scientists. 132 00:10:02,266 --> 00:10:06,467 This was just a few years after the discovery of x-rays. 133 00:10:06,600 --> 00:10:09,533 Marie Curie and her husband and research partner, 134 00:10:09,667 --> 00:10:13,867 Pierre, wanted to know how a piece of matter could make it 135 00:10:14,000 --> 00:10:17,700 possible to see through skin and even walls. 136 00:10:18,567 --> 00:10:21,433 The knowledge that there were rare places in the world where 137 00:10:21,567 --> 00:10:24,233 rocks, rich in uranium, possess these strange 138 00:10:24,367 --> 00:10:28,467 properties inspired Marie on her scientific quest. 139 00:10:29,734 --> 00:10:32,867 The dull brown ore, still mixed with pine needles, 140 00:10:33,000 --> 00:10:36,967 came from the part of Eastern Europe that is now the Czech Republic. 141 00:10:37,600 --> 00:10:40,467 But this material was very rare. 142 00:10:40,600 --> 00:10:43,633 And even to distill a tiny amount of it required 143 00:10:43,767 --> 00:10:46,734 the most lengthy and labor intensive efforts. 144 00:10:53,233 --> 00:10:55,867 She was later to write, 145 00:10:56,000 --> 00:11:00,300 "we lived in our single occupation, as in a dream." 146 00:11:00,433 --> 00:11:04,400 (thunder, raining) 147 00:11:05,433 --> 00:11:07,867 They worked under the worst possible conditions to 148 00:11:08,000 --> 00:11:11,700 purify the ore into a mineral called pitchblende, 149 00:11:11,834 --> 00:11:15,433 which was 50 to 80% uranium. 150 00:11:18,333 --> 00:11:21,300 This was quite an achievement, but Marie and Pierre were 151 00:11:21,433 --> 00:11:25,233 hunting for something far more rare. 152 00:11:27,567 --> 00:11:31,633 It took them three years to process tons of ore. 153 00:11:31,767 --> 00:11:37,133 To isolate a mere tenth of a gram of a substance she named radium. 154 00:11:38,200 --> 00:11:41,900 Marie and Pierre had discovered a completely new element. 155 00:11:43,600 --> 00:11:46,667 The Curies showed that the radium was entirely 156 00:11:46,800 --> 00:11:49,967 unaffected by extreme temperatures. 157 00:11:50,100 --> 00:11:51,934 That was strange. 158 00:11:52,066 --> 00:11:54,200 Most things subjected to such intense heat would 159 00:11:54,333 --> 00:11:56,834 change drastically. 160 00:11:56,967 --> 00:11:59,400 And, there was something else. 161 00:11:59,533 --> 00:12:02,266 It spontaneously emitted energy. 162 00:12:02,400 --> 00:12:04,367 Not through chemical reactions, 163 00:12:04,500 --> 00:12:07,100 but through some unknown mechanism. 164 00:12:07,233 --> 00:12:11,033 Marie Curie called this new phenomenon radioactivity. 165 00:12:13,033 --> 00:12:16,533 She and Pierre calculated the energy that spontaneously 166 00:12:16,667 --> 00:12:19,834 flowed from a lump of radium would be much greater than 167 00:12:19,967 --> 00:12:22,300 burning the same amount of coal. 168 00:12:22,433 --> 00:12:24,934 Radioactivity, to their astonishment, 169 00:12:25,066 --> 00:12:29,533 was millions of times more potent than chemical energy. 170 00:12:29,667 --> 00:12:31,567 The difference between liberating the energy that 171 00:12:31,700 --> 00:12:34,767 resides in molecules and the far greater power 172 00:12:34,900 --> 00:12:37,467 stored deeper down. 173 00:12:40,500 --> 00:12:43,567 Between Marie, Pierre, little Irene and the man 174 00:12:43,700 --> 00:12:45,767 she would later marry, 175 00:12:45,900 --> 00:12:49,967 the family would win five Nobel prizes in science. 176 00:12:54,233 --> 00:12:58,867 (fire crackling) 177 00:13:02,066 --> 00:13:05,133 The bottles, tubes and flasks of pitchblende that 178 00:13:05,266 --> 00:13:09,467 they had refined, left a residue of radium particles. 179 00:13:09,934 --> 00:13:13,567 They were so potent, that they lit up the lab at night. 180 00:13:14,233 --> 00:13:18,834 As Marie wrote years later, "they were like Earthly stars, 181 00:13:18,967 --> 00:13:23,500 these glowing tubes in that poor rough shack." 182 00:13:27,600 --> 00:13:30,100 Marie leapt to the correct conclusion that the 183 00:13:30,233 --> 00:13:32,834 luminescence was due to something happening inside 184 00:13:32,967 --> 00:13:36,500 the nuclei of radioactive atoms. 185 00:13:36,633 --> 00:13:39,433 For thousands of years, it had been thought that atoms were 186 00:13:39,567 --> 00:13:42,400 the smallest unit of matter. 187 00:13:42,533 --> 00:13:46,266 Curie's earthly stars were evidence that within the atom 188 00:13:46,400 --> 00:13:48,867 was a possible world where even smaller 189 00:13:49,000 --> 00:13:52,367 particles were interacting. 190 00:13:52,500 --> 00:13:56,467 100 years after this magical night, 191 00:13:56,600 --> 00:13:59,934 Marie Curie's cookbooks still glowed with the exquisite 192 00:14:00,066 --> 00:14:03,533 radioactivity she had discovered. 193 00:14:03,667 --> 00:14:07,300 But it took a little time for the darker implications of 194 00:14:07,433 --> 00:14:10,567 this deeper understanding of nature to dawn in the mind of 195 00:14:10,700 --> 00:14:14,166 a visionary named H.G. Wells. 196 00:14:14,533 --> 00:14:17,233 A writer, who was a genius at turning the 197 00:14:17,367 --> 00:14:20,000 new revelations of science into stories 198 00:14:20,133 --> 00:14:22,600 that captivated the world. 199 00:14:22,734 --> 00:14:27,767 And foreseeing as no one else, their gravest consequences. 200 00:14:33,433 --> 00:14:36,033 TYSON: The writer H.G. Wells, 201 00:14:36,166 --> 00:14:39,300 who first imagined time machines and alien invasions 202 00:14:39,433 --> 00:14:42,400 had a nightmare of a future world where atoms 203 00:14:42,533 --> 00:14:43,734 were weaponized. 204 00:14:43,867 --> 00:14:47,266 In his book called The World Set Free written in 1913, 205 00:14:47,400 --> 00:14:49,967 he coined the phrase atomic bombs. 206 00:14:50,100 --> 00:14:53,734 And loosed them on helpless civilian populations. 207 00:14:54,600 --> 00:14:57,400 He set his vision of a nuclear war between England and 208 00:14:57,533 --> 00:15:02,567 Germany in the impossibly distant future of the 1950's. 209 00:15:11,767 --> 00:15:18,333 ♪ ♪ 210 00:15:18,467 --> 00:15:21,266 (explosion) 211 00:15:30,100 --> 00:15:33,300 In 1933, the Hungarian physicist, 212 00:15:33,433 --> 00:15:37,967 Leo Szilard, was contemplating becoming a biologist. 213 00:15:38,100 --> 00:15:39,367 (knocking) 214 00:15:39,500 --> 00:15:41,166 MAID: Dr. Szilard? 215 00:15:41,300 --> 00:15:43,300 Are you quite all right in there? 216 00:15:43,433 --> 00:15:47,233 TYSON: He read Wells' novel and it started him thinking. 217 00:15:48,633 --> 00:15:51,800 (chatter) 218 00:15:54,200 --> 00:15:56,633 TYSON: Szilard knew that atoms are made of protons and 219 00:15:56,767 --> 00:15:58,700 neutrons on the inside. 220 00:15:58,834 --> 00:16:02,200 And a skittering veil of electrons on the outside. 221 00:16:02,333 --> 00:16:05,266 Suddenly, awaiting for the light to change at this 222 00:16:05,400 --> 00:16:09,467 intersection in London, he was struck by the thought, 223 00:16:09,600 --> 00:16:12,133 if he could find a sufficiently large amount of 224 00:16:12,266 --> 00:16:16,367 an element that would emit two neutrons when it absorbed one, 225 00:16:16,500 --> 00:16:20,333 it would sustain a nuclear chain reaction. 226 00:16:21,233 --> 00:16:23,767 Two would produce four, four would produce eight 227 00:16:23,900 --> 00:16:25,567 and so forth. 228 00:16:25,700 --> 00:16:29,000 Until enormous amounts of energy in the nucleus itself 229 00:16:29,133 --> 00:16:31,734 could be liberated. 230 00:16:31,867 --> 00:16:35,033 Not a chemical reaction, but a nuclear one. 231 00:16:35,166 --> 00:16:36,033 (gasping) 232 00:16:36,166 --> 00:16:38,500 (air raid alarm) 233 00:16:38,633 --> 00:16:40,834 (explosion) 234 00:16:41,834 --> 00:16:44,000 (honking) 235 00:16:44,400 --> 00:16:46,400 (grunts) 236 00:16:46,533 --> 00:16:50,800 TYSON: This was the moment our world changed. 237 00:16:54,734 --> 00:16:58,233 Leo Szilard also knew the power of exponentials and 238 00:16:58,367 --> 00:17:01,166 if a neutron chain reaction could be triggered down there 239 00:17:01,300 --> 00:17:03,600 in world of the atom's nucleus, 240 00:17:03,734 --> 00:17:06,233 then something like Wells' imaginary atomic bomb 241 00:17:06,367 --> 00:17:08,066 might be possible. 242 00:17:08,200 --> 00:17:11,433 He shuddered at the thought of this destructive capability. 243 00:17:11,567 --> 00:17:14,367 It was just the latest development on a continuum 244 00:17:14,500 --> 00:17:18,667 of violence that began long long before. 245 00:17:23,433 --> 00:17:25,367 50,000 years ago, 246 00:17:25,500 --> 00:17:29,333 all humans were roving bands of hunter-gatherers. 247 00:17:29,467 --> 00:17:32,133 They communicated over limited areas by 248 00:17:32,266 --> 00:17:34,266 calling to one another. 249 00:17:34,400 --> 00:17:36,600 That is, at the speed of sound. 250 00:17:36,734 --> 00:17:39,667 Around 750 miles per hour. 251 00:17:39,800 --> 00:17:42,734 But over longer distances, they could communicate only 252 00:17:42,867 --> 00:17:45,133 as fast as they could run. 253 00:17:45,266 --> 00:17:47,967 Around 12,000 years ago, about the same time as the 254 00:17:48,100 --> 00:17:50,934 invention of agriculture, they developed the power to 255 00:17:51,133 --> 00:17:53,633 kill at a longer distance. 256 00:17:53,767 --> 00:17:56,967 The kill radius expanded to the arc of an arrow 257 00:17:57,100 --> 00:17:58,934 launched by a bow. 258 00:17:59,066 --> 00:18:02,533 And they could kill one person with a single arrow. 259 00:18:02,667 --> 00:18:05,633 Our ancestors were not particularly warlike because 260 00:18:05,767 --> 00:18:08,700 there was so few people and so much room back then that 261 00:18:08,834 --> 00:18:12,100 moving on was preferable to armed conflict. 262 00:18:12,233 --> 00:18:15,567 Their weapons were used almost entirely for hunting. 263 00:18:15,700 --> 00:18:18,734 Their identification horizon was likely small. 264 00:18:18,867 --> 00:18:21,000 Only with the other members of their band of 265 00:18:21,133 --> 00:18:23,233 50 or 100 people. 266 00:18:23,367 --> 00:18:27,934 But their time horizon took a giant leap. 267 00:18:31,467 --> 00:18:34,467 They worked long and hard planting crops in the here and 268 00:18:34,600 --> 00:18:39,066 now, so several months later, they could harvest them. 269 00:18:39,200 --> 00:18:43,400 They postponed present gratification for later advantage. 270 00:18:45,200 --> 00:18:50,166 They began to plan for the future. 271 00:18:52,533 --> 00:18:56,967 By about 2,500 years ago, there was a new kind of war. 272 00:18:57,100 --> 00:18:59,800 The conquered territories of Alexander stretched from 273 00:18:59,934 --> 00:19:02,467 Macedonia to the Indus Valley. 274 00:19:02,600 --> 00:19:05,967 There were now many on planet Earth who owed allegiance to 275 00:19:06,100 --> 00:19:08,900 groups composed of millions. 276 00:19:09,033 --> 00:19:10,700 Over long distances, 277 00:19:10,834 --> 00:19:13,200 maximum speed of both communication and transportation 278 00:19:13,333 --> 00:19:16,333 was the speed of the sail and the horse. 279 00:19:16,467 --> 00:19:19,200 Archidamus III, King of Sparta, 280 00:19:19,333 --> 00:19:22,266 was famed for his unflinching courage. 281 00:19:22,400 --> 00:19:26,433 He relished taking part in hand to hand combat with the enemy. 282 00:19:26,567 --> 00:19:30,400 It is said that when he first saw a projectile hurled by a 283 00:19:30,533 --> 00:19:33,767 Balista, he cried out in anguish. 284 00:19:33,900 --> 00:19:38,433 "Oh Hercules! The valor of man is lost!" 285 00:19:38,567 --> 00:19:41,200 (screaming) 286 00:19:43,800 --> 00:19:46,567 (groaning) 287 00:19:48,233 --> 00:19:50,400 Both the kill range and the kill ratio 288 00:19:50,533 --> 00:19:53,133 had increased exponentially. 289 00:19:53,266 --> 00:19:57,467 Now, ten corpses lay where one would have been. 290 00:19:57,600 --> 00:20:00,300 And the soldier who released the lever on the siege engine 291 00:20:00,433 --> 00:20:03,133 never even saw their faces. 292 00:20:03,266 --> 00:20:06,133 He remained far removed from the carnage on the other side 293 00:20:06,266 --> 00:20:08,934 of the city wall. 294 00:20:11,500 --> 00:20:14,934 Today, the maximum speed of transportation is the escape 295 00:20:15,066 --> 00:20:16,934 velocity from Earth. 296 00:20:17,066 --> 00:20:19,500 25,000 miles per hour. 297 00:20:19,633 --> 00:20:22,767 The speed of communication is the speed of light. 298 00:20:22,900 --> 00:20:26,533 The identification horizons have also expanded enormously. 299 00:20:26,667 --> 00:20:29,400 For some, it's a billion or more. 300 00:20:29,533 --> 00:20:32,233 For others, it's our whole species. 301 00:20:32,367 --> 00:20:36,100 And for a few, it's all living things. 302 00:20:36,233 --> 00:20:39,166 The kill radius, in the worst case scenario, 303 00:20:39,300 --> 00:20:42,734 is now our global civilization. 304 00:20:44,667 --> 00:20:47,033 How did we get here? 305 00:20:47,166 --> 00:20:51,633 It was the result of a deadly embrace between science and state. 306 00:20:51,767 --> 00:20:55,000 And there was one scientist for whom no amount of 307 00:20:55,133 --> 00:20:57,834 destructive power was enough. 308 00:20:57,967 --> 00:20:59,700 (distant explosion) 309 00:20:59,834 --> 00:21:03,934 (air raid alarm) 310 00:21:14,533 --> 00:21:16,900 TYSON: It's hard to pinpoint the precise moment when the 311 00:21:17,033 --> 00:21:19,633 first nuclear war began. 312 00:21:19,767 --> 00:21:22,700 Some might trace it all the way back to that arrow sailing 313 00:21:22,834 --> 00:21:24,667 over the treetops. 314 00:21:24,800 --> 00:21:27,400 Others might say it started much later, 315 00:21:27,533 --> 00:21:30,633 with three messages. 316 00:21:38,934 --> 00:21:42,567 In 1939 on Adolf Hitler's birthday, 317 00:21:42,700 --> 00:21:45,100 one of his brightest young scientists, 318 00:21:45,233 --> 00:21:49,633 Paul Harteck, had a special gift in mind for his Führer. 319 00:21:50,600 --> 00:21:54,133 Harteck wrote a letter to the Nazi war office, 320 00:21:54,266 --> 00:21:57,734 he wished to inform them that the latest developments in 321 00:21:57,867 --> 00:22:01,633 nuclear physics would make it possible to produce an explosive 322 00:22:01,767 --> 00:22:05,500 exponentially more powerful than conventional weapons. 323 00:22:06,834 --> 00:22:11,633 He was trying to give an atomic bomb to Adolf Hitler. 324 00:22:12,066 --> 00:22:15,367 But Hitler would never get his hands on a nuclear weapon, 325 00:22:15,500 --> 00:22:18,400 he had murdered, imprisoned or exiled many of the great 326 00:22:18,533 --> 00:22:20,867 physicists in his territories. 327 00:22:21,000 --> 00:22:23,900 Those who happened to be Jews or liberals and 328 00:22:24,033 --> 00:22:27,166 many who were both. 329 00:22:29,467 --> 00:22:32,100 Exactly a month before the war began, 330 00:22:32,233 --> 00:22:35,166 Leo Szilard made a pilgrimage to the house Albert Einstein 331 00:22:35,300 --> 00:22:37,467 was renting on Long Island. 332 00:22:37,600 --> 00:22:40,000 The physicist who usually chauffeured Leo Szilard on 333 00:22:40,133 --> 00:22:45,233 trips out of Manhattan was unavailable that August day in 1939. 334 00:22:45,367 --> 00:22:50,066 So, Szilard enlisted the services of a fellow Hungarian emigrate, 335 00:22:50,200 --> 00:22:54,233 a young scientist named Edward Teller. 336 00:22:54,367 --> 00:22:56,934 Persecution in Budapest sent him and his family to 337 00:22:57,066 --> 00:22:59,133 take refuge in Munich, 338 00:22:59,266 --> 00:23:02,200 where he lost his right foot in a traffic accident. 339 00:23:02,333 --> 00:23:05,567 In the early 1930s, Teller and his family were forced 340 00:23:05,700 --> 00:23:08,300 to flee once again. 341 00:23:08,433 --> 00:23:11,800 Just as Harteck felt it his duty to inform Hitler. 342 00:23:11,934 --> 00:23:14,867 Szilard wanted President Franklin Roosevelt to know 343 00:23:15,000 --> 00:23:18,066 the awesome power of such a weapon. 344 00:23:18,200 --> 00:23:21,200 There was no scientist on Earth whose prestige and 345 00:23:21,333 --> 00:23:24,667 influence was comparable to Einstein's. 346 00:23:24,800 --> 00:23:27,600 Einstein's nightmare was imagining Hitler with a 347 00:23:27,734 --> 00:23:30,667 nuclear weapon at his disposal. 348 00:23:30,800 --> 00:23:33,033 But what would be the long-term consequences of 349 00:23:33,166 --> 00:23:35,200 this dangerous new knowledge? 350 00:23:35,333 --> 00:23:39,467 Which, once unleashed, could never be taken back. 351 00:23:39,600 --> 00:23:42,133 Einstein would take no role in the U.S. 352 00:23:42,266 --> 00:23:44,433 effort to build the atomic bomb, 353 00:23:44,567 --> 00:23:47,266 which became known as "The Manhattan Project." 354 00:23:47,400 --> 00:23:50,200 But he did alert the President to the potential use of 355 00:23:50,333 --> 00:23:53,367 atomic nuclei in warfare. 356 00:23:55,800 --> 00:23:58,767 After the war was over, he told a reporter that if he had 357 00:23:58,900 --> 00:24:01,533 known the Germans would fail in developing in an atomic 358 00:24:01,667 --> 00:24:05,100 bomb, he never would have signed the letter. 359 00:24:05,233 --> 00:24:08,100 But Edward Teller had no such ambivalence. 360 00:24:08,233 --> 00:24:13,200 He couldn't wait to get started on weaponizing the atom. 361 00:24:14,233 --> 00:24:19,066 The Russian physicist, G.N. Flyorov had tried for years to alert his leader, 362 00:24:19,200 --> 00:24:22,633 Joseph Stalin, to the possible military applications of a 363 00:24:22,767 --> 00:24:24,900 nuclear chain reaction. 364 00:24:25,033 --> 00:24:28,400 But the Soviet Union was under siege by the Germans. 365 00:24:28,533 --> 00:24:32,934 And an atom bomb project was likely to take years to complete. 366 00:24:33,066 --> 00:24:35,033 With their backs against the wall, 367 00:24:35,166 --> 00:24:38,100 it seemed too impractical to even think about. 368 00:24:38,233 --> 00:24:39,433 (coughing) 369 00:24:39,567 --> 00:24:43,367 In 1942, Flyorov had published a scientific paper 370 00:24:43,500 --> 00:24:45,567 on nuclear physics. 371 00:24:45,700 --> 00:24:48,934 Now, he was excited to see what the eminent physicists 372 00:24:49,066 --> 00:24:52,767 in Europe and the United States had to say about it. 373 00:24:52,900 --> 00:24:54,867 Flyorov was puzzled. 374 00:24:55,000 --> 00:24:57,333 None of the physicists of the International Scientific 375 00:24:57,467 --> 00:25:01,100 Community thought his paper worthy of comment. 376 00:25:01,233 --> 00:25:05,467 At first, he was hurt, but then he realized what was 377 00:25:05,600 --> 00:25:08,433 really happening. 378 00:25:08,567 --> 00:25:12,333 American and German scientific journals were being scrubbed 379 00:25:12,467 --> 00:25:16,400 of any nuclear physics papers as both nations secretly 380 00:25:16,533 --> 00:25:18,700 worked on building the bomb. 381 00:25:18,834 --> 00:25:21,233 It was this absence of published data, 382 00:25:21,367 --> 00:25:24,433 the dogs that did not bark, that moved Flyorov to 383 00:25:24,567 --> 00:25:27,467 re-double his efforts to convince Stalin to start his 384 00:25:27,600 --> 00:25:30,500 own nuclear weapons program. 385 00:25:30,633 --> 00:25:34,000 In all three cases, it was the scientists, 386 00:25:34,133 --> 00:25:36,467 not the generals or the arms dealers, 387 00:25:36,600 --> 00:25:39,700 who informed their leaders that a huge increase in 388 00:25:39,834 --> 00:25:42,066 kill ratio was possible. 389 00:25:44,066 --> 00:25:46,066 The U.S. Department of War 390 00:25:46,200 --> 00:25:49,367 chose the remote location of Los Alamos, New Mexico 391 00:25:49,500 --> 00:25:53,266 as the headquarters for the atomic bomb research project. 392 00:25:54,500 --> 00:25:57,900 It had been recommended by the project's director, 393 00:25:58,033 --> 00:26:01,066 physicist J. Robert Oppenheimer, 394 00:26:01,200 --> 00:26:05,033 who had recuperated there from an illness as a teenager. 395 00:26:05,166 --> 00:26:09,433 But for Edward Teller, an atomic bomb wasn't big enough. 396 00:26:09,567 --> 00:26:12,467 He dreamed of even greater lethality. 397 00:26:12,600 --> 00:26:15,533 A weapon in which the atomic bomb was nothing more than a 398 00:26:15,667 --> 00:26:19,100 match to light a fuse to the nucleus. 399 00:26:19,233 --> 00:26:21,800 A thermal nuclear weapon. 400 00:26:21,934 --> 00:26:25,734 What Teller affectionately called, the super. 401 00:26:25,867 --> 00:26:29,834 If Edward Teller had a polar opposite in the scientific community, 402 00:26:29,967 --> 00:26:32,800 it would have been Joseph Rotblat. 403 00:26:32,934 --> 00:26:36,066 Rotblat was born in Warsaw to a wealthy family, 404 00:26:36,200 --> 00:26:39,834 who like Teller's, had lost everything. 405 00:26:39,967 --> 00:26:43,900 In the summer of 1939, just before the Nazis invaded, 406 00:26:44,033 --> 00:26:47,200 he was invited to England to take a research position at 407 00:26:47,333 --> 00:26:49,700 the University of Liverpool. 408 00:26:49,834 --> 00:26:52,000 At the last minute before his departure, 409 00:26:52,133 --> 00:26:56,800 his beloved wife, Tola had an emergency appendectomy. 410 00:26:56,934 --> 00:26:59,233 She was forced to remain behind until she was 411 00:26:59,367 --> 00:27:01,433 well enough to travel. 412 00:27:01,567 --> 00:27:05,734 Tola insisted that Joseph go on ahead to prepare their new home. 413 00:27:05,867 --> 00:27:09,333 It would just be a matter of weeks, she told him. 414 00:27:13,600 --> 00:27:16,834 The challenge, was to find a chemical fuse that 415 00:27:16,967 --> 00:27:19,300 would light the nuclear chain reaction, 416 00:27:19,433 --> 00:27:22,767 first imagined by Leo Szilard in London. 417 00:27:22,900 --> 00:27:25,900 The scientists and engineers told themselves that they 418 00:27:26,033 --> 00:27:29,400 would be averting a grave danger by building a bomb 419 00:27:29,533 --> 00:27:32,433 of unprecedented destructive power. 420 00:27:32,567 --> 00:27:35,166 Their government could be trusted. 421 00:27:35,300 --> 00:27:37,734 They would never use such a weapon in an act of 422 00:27:37,867 --> 00:27:41,333 aggression, not like those other governments. 423 00:27:42,200 --> 00:27:45,166 These atomic scientists were the first to see 424 00:27:45,300 --> 00:27:49,700 building nuclear weapons as a deterrent to using them. 425 00:27:50,900 --> 00:27:54,133 The fear of Hitler with an atomic bomb was the driving 426 00:27:54,266 --> 00:27:57,033 rationale for the Manhattan Project. 427 00:27:57,166 --> 00:28:01,166 And yet, when Germany surrendered and Hitler was no more, 428 00:28:01,300 --> 00:28:04,300 of the thousands of scientists who worked on the bomb, 429 00:28:04,433 --> 00:28:07,600 only one resigned. 430 00:28:07,734 --> 00:28:10,266 It was Joe Rotblat. 431 00:28:10,400 --> 00:28:12,834 In the years that followed, whenever he was asked about 432 00:28:12,967 --> 00:28:16,166 his decision, he always rejected any suggestion that 433 00:28:16,300 --> 00:28:19,967 he had done so out of moral superiority. 434 00:28:20,100 --> 00:28:23,567 He would just smile and say, the truth was that he 435 00:28:23,700 --> 00:28:26,734 desperately missed his wife, who had been prevented from 436 00:28:26,867 --> 00:28:31,200 leaving Warsaw and lost to him in the chaos of the war. 437 00:28:32,100 --> 00:28:33,633 With its end in Europe 438 00:28:33,767 --> 00:28:36,867 came his chance to go and search for her. 439 00:28:37,000 --> 00:28:39,500 But, he never found her. 440 00:28:39,633 --> 00:28:43,367 Except as a name on a list of the dead. 441 00:28:43,500 --> 00:28:46,333 Tola had perished in the Holocaust. 442 00:28:46,467 --> 00:28:49,734 Exterminated at the Belzec concentration camp. 443 00:28:50,600 --> 00:28:53,166 Although he lived another 60 years, 444 00:28:53,300 --> 00:28:56,133 Rotblat never remarried. 445 00:28:56,266 --> 00:28:58,800 (explosion) 446 00:28:58,934 --> 00:29:01,066 Of the three nations that pursued wartime research 447 00:29:01,200 --> 00:29:03,200 into building the bomb, 448 00:29:03,333 --> 00:29:06,767 only the U. S. succeeded before the war's end. 449 00:29:06,900 --> 00:29:09,533 And historians believe that was because America had 450 00:29:09,667 --> 00:29:12,934 taken in so many immigrants. 451 00:29:13,066 --> 00:29:15,467 Of the leading figures in the Manhattan Project, 452 00:29:15,600 --> 00:29:18,266 only two were native born. 453 00:29:18,400 --> 00:29:21,834 And only one got his PhD in the U.S. 454 00:29:23,734 --> 00:29:26,266 Atomic bombs were dropped on the Japanese cities of 455 00:29:26,400 --> 00:29:31,233 Hiroshima and Nagasaki, ending the second World War. 456 00:29:31,367 --> 00:29:34,266 Two months later, President Truman invited Oppenheimer 457 00:29:34,400 --> 00:29:37,734 for congratulations in the Oval Office. 458 00:29:37,867 --> 00:29:39,767 But to Truman's dismay, 459 00:29:39,900 --> 00:29:43,200 Oppenheimer was in no mood to celebrate. 460 00:29:43,333 --> 00:29:47,333 OPPENHEIMER: Mr. President, I feel like I have blood on my hands. 461 00:29:47,467 --> 00:29:49,300 TRUMAN: Don't be a fool. 462 00:29:49,433 --> 00:29:51,500 If anyone has blood on their hands, it's me. 463 00:29:51,633 --> 00:29:53,567 And it doesn't bother me at all. 464 00:29:55,066 --> 00:29:57,433 OPPENHEIMER: How long do you think it will be before the 465 00:29:57,567 --> 00:29:59,834 Russians get the bomb? 466 00:29:59,967 --> 00:30:01,667 TRUMAN: Never! 467 00:30:04,734 --> 00:30:07,767 Don't you ever let that cry baby scientist anywhere 468 00:30:07,900 --> 00:30:10,633 near me again, do you hear? 469 00:30:10,767 --> 00:30:13,033 TYSON: Less than four years later, 470 00:30:13,166 --> 00:30:16,133 the Russians exploded their own atomic bomb. 471 00:30:16,266 --> 00:30:18,900 And shortly after, both nations went on to create 472 00:30:19,033 --> 00:30:23,166 supers: thermonuclear hydrogen bombs. 473 00:30:23,900 --> 00:30:26,734 The nuclear arms race begun by those three letters from 474 00:30:26,867 --> 00:30:31,633 scientists was off to a terrifying start. 475 00:30:32,333 --> 00:30:35,900 After the war, Teller's dreams of greater and greater killing 476 00:30:36,033 --> 00:30:38,633 power were to come true. 477 00:30:38,767 --> 00:30:41,767 The early 1950s, when the Communist witch hunts began 478 00:30:41,900 --> 00:30:44,800 in the United States, he was perfectly happy to hint 479 00:30:44,934 --> 00:30:47,934 that Robert Oppenheimer, his former boss, 480 00:30:48,066 --> 00:30:50,767 who had brilliantly run the Manhattan Project, 481 00:30:50,900 --> 00:30:53,166 should be stripped of his security clearance, 482 00:30:53,300 --> 00:30:56,333 thereby ruining Oppenheimer's career. 483 00:31:16,500 --> 00:31:20,934 Despite dramatic reductions in nuclear arsenals, 484 00:31:21,066 --> 00:31:24,967 the specter of nuclear war haunts us still. 485 00:31:26,266 --> 00:31:28,567 How can we sleep so soundly 486 00:31:28,700 --> 00:31:33,100 in the shadow of a smoking volcano? 487 00:31:36,266 --> 00:31:38,633 In another time, there were others who faced a 488 00:31:38,767 --> 00:31:43,266 grave danger as if immobilized in a dream. 489 00:31:54,133 --> 00:32:00,500 ♪ ♪ 490 00:32:04,700 --> 00:32:07,200 TYSON: Let me tell you a story. 491 00:32:07,333 --> 00:32:09,667 Two men walk into a bar. 492 00:32:11,200 --> 00:32:14,567 ♪ ♪ 493 00:32:14,700 --> 00:32:16,166 And they got into a fight. 494 00:32:16,300 --> 00:32:17,900 (glass breaking) 495 00:32:18,033 --> 00:32:20,667 (grunting) 496 00:32:24,000 --> 00:32:26,000 (grunting) 497 00:32:26,133 --> 00:32:28,266 (gasps) 498 00:32:28,400 --> 00:32:29,900 SOLDIERS: Allez! 499 00:32:30,033 --> 00:32:31,700 (grunts) 500 00:32:34,100 --> 00:32:37,266 TYSON: Louis-Auguste Cyparis was arrested and taken to the 501 00:32:37,400 --> 00:32:40,967 Saint Pierre Prison, where he was locked in the dungeon. 502 00:32:44,867 --> 00:32:47,500 (grunting) 503 00:32:51,300 --> 00:32:53,633 TYSON: This all happened on the French colonial island of 504 00:32:53,767 --> 00:32:57,467 Martinique in the Caribbean in 1902. 505 00:32:57,600 --> 00:33:00,633 In the midst of an election campaign. 506 00:33:04,934 --> 00:33:09,433 On this April morning, Fernan Cleric stepped outside 507 00:33:09,567 --> 00:33:11,767 to admire the view. 508 00:33:11,900 --> 00:33:14,600 He was master of all he surveyed. 509 00:33:14,734 --> 00:33:18,000 The factories that turned the island's trees into furniture. 510 00:33:18,133 --> 00:33:21,166 And the fields of sugar cane and coffee. 511 00:33:22,133 --> 00:33:23,834 That's strange. 512 00:33:23,967 --> 00:33:27,633 Why would there be frost on such a sunny warm morning? 513 00:33:27,767 --> 00:33:31,433 But it wasn't frost, it was ash from the volcano, 514 00:33:31,567 --> 00:33:33,500 Mount Pelée. 515 00:33:37,734 --> 00:33:40,467 (eruption) 516 00:33:41,000 --> 00:33:43,200 (gasps) 517 00:33:58,166 --> 00:34:00,333 TYSON: When the ash began to fall, 518 00:34:00,467 --> 00:34:02,867 Claire Apprentice, wife of the American Council 519 00:34:03,000 --> 00:34:06,200 considered going home to Massachusetts. 520 00:34:06,333 --> 00:34:08,467 No, but that was out of the question. 521 00:34:08,600 --> 00:34:11,266 There was the gala she planned for the following week, 522 00:34:11,400 --> 00:34:14,600 postponing it was unthinkable. 523 00:34:19,166 --> 00:34:22,834 And there were many who were too poor to leave their meager 524 00:34:22,967 --> 00:34:26,166 possessions and flee the city of Saint Pierre for a 525 00:34:26,300 --> 00:34:29,066 safer part of the island. 526 00:34:29,200 --> 00:34:31,467 Others, with the means to do so, 527 00:34:31,600 --> 00:34:34,567 departed on boats. 528 00:34:40,633 --> 00:34:43,300 Mayor Fouché worked late into the evening, 529 00:34:43,433 --> 00:34:47,633 drafting detailed plans for the Ascension Day Banquet and Ball. 530 00:34:47,767 --> 00:34:49,600 Meanwhile, below... 531 00:34:49,734 --> 00:34:52,734 Servants cleaned ash from the banquet hall 532 00:34:52,867 --> 00:34:56,033 in preparation for the event. 533 00:35:01,333 --> 00:35:04,367 The closest thing to a scientist on the island of Martinique 534 00:35:04,500 --> 00:35:08,967 was an elementary school teacher named Gaston Landes. 535 00:35:09,900 --> 00:35:12,266 Landes actually made a pilgrimage to the newly 536 00:35:12,400 --> 00:35:15,734 awakened volcanic crater and shared his observations of 537 00:35:15,867 --> 00:35:18,867 heightened activity in the newspaper. 538 00:35:19,000 --> 00:35:20,767 But Landes was more concerned about his 539 00:35:20,900 --> 00:35:23,100 forthcoming trip to Paris. 540 00:35:23,233 --> 00:35:26,200 He was to display samples of the island's plant life along 541 00:35:26,333 --> 00:35:29,667 with the lecture he had been asked to give. 542 00:35:31,266 --> 00:35:33,900 But, with the ash falling at this rate, 543 00:35:34,033 --> 00:35:36,400 his specimens would all be ruined. 544 00:35:43,533 --> 00:35:48,233 Mayor Fouché mustered enough resolve to create a new poster. 545 00:35:48,367 --> 00:35:51,567 "Fellow citizens, be not afraid. 546 00:35:51,700 --> 00:35:54,633 No lava flows could reach the city in the near future. 547 00:35:54,767 --> 00:35:58,333 We have seven kilometers between us and the volcano. 548 00:35:58,467 --> 00:36:01,567 The amount of lava would have to be impossibly huge 549 00:36:01,700 --> 00:36:04,900 to cross the two immense valleys and the swamp 550 00:36:05,033 --> 00:36:07,834 between us and Mount Peleé." 551 00:36:08,900 --> 00:36:14,867 (coughing) 552 00:36:15,834 --> 00:36:18,400 In the early hours of May 7th, 553 00:36:18,533 --> 00:36:22,233 the people Saint Pierre awoke to thundering seismic tremors 554 00:36:22,367 --> 00:36:26,400 and volcanic lightning near the mouth of the hellish volcano. 555 00:36:27,433 --> 00:36:31,700 Now, mass panic began to spread. 556 00:36:31,834 --> 00:36:35,433 Troops were dispatched to try and calm the public. 557 00:36:36,800 --> 00:36:38,800 And then... 558 00:36:38,934 --> 00:36:41,233 Just before the dawn of Thursday morning. 559 00:36:41,367 --> 00:36:42,834 May 8th. 560 00:36:42,967 --> 00:36:45,934 The volcano became utterly calm. 561 00:36:46,066 --> 00:36:48,533 The air was cool and fresh. 562 00:36:48,667 --> 00:36:52,166 And the sea like glass. 563 00:36:53,367 --> 00:36:55,300 (eruption) 564 00:36:55,433 --> 00:36:56,800 (screaming) 565 00:36:56,934 --> 00:36:59,333 TYSON: When Mount Pelée erupted at 8:02 AM on 566 00:36:59,467 --> 00:37:04,033 May 8th, 1902, the explosion produced a sound so loud 567 00:37:04,166 --> 00:37:08,500 it was heard 500 miles away, in Venezuela. 568 00:37:10,767 --> 00:37:13,033 The massive pyroclastic flood, 569 00:37:13,166 --> 00:37:15,700 a death cloud of super-heated gasses, 570 00:37:15,834 --> 00:37:19,900 crossed the valleys to the city in minutes. 571 00:37:24,633 --> 00:37:27,266 The explosion was the equivalent of just one 572 00:37:27,400 --> 00:37:31,133 strategic nuclear warhead. 573 00:37:32,834 --> 00:37:35,066 Three days after the eruption, 574 00:37:35,200 --> 00:37:37,066 men from the other part of the island, 575 00:37:37,200 --> 00:37:40,500 combed the still smoking streets of Saint Pierre. 576 00:37:40,633 --> 00:37:44,467 To collect the bodies and burn what the volcano had failed 577 00:37:44,600 --> 00:37:46,667 to consume completely. 578 00:37:46,800 --> 00:37:48,600 (grunting) 579 00:37:49,100 --> 00:37:52,433 (calling) 580 00:38:02,367 --> 00:38:04,400 TYSON: Few have ever experienced what 581 00:38:04,533 --> 00:38:08,834 Louis-Auguste Cyparis endured and lived to tell. 582 00:38:09,533 --> 00:38:12,467 When the volcano erupted, he heard the screams of his 583 00:38:12,600 --> 00:38:17,467 captors briefly before a terrifying silence. 584 00:38:18,667 --> 00:38:21,100 And then, a fierce heat came blasting through the 585 00:38:21,233 --> 00:38:23,567 tiny vent in his cell. 586 00:38:23,700 --> 00:38:25,700 He hopped and jumped around to avoid it, 587 00:38:25,834 --> 00:38:28,533 but was still severely burned up to his shoulders. 588 00:38:29,500 --> 00:38:32,200 For three days he suffered in agony with 589 00:38:32,333 --> 00:38:36,633 no other sustenance than the moisture on the walls of his cell. 590 00:38:37,600 --> 00:38:40,000 His sentence to solitary confinement in the thick 591 00:38:40,133 --> 00:38:43,700 walled dungeon had saved his life. 592 00:38:43,834 --> 00:38:47,600 He was one of only two survivors of the 593 00:38:47,734 --> 00:38:52,266 30,000 citizens of Saint Pierre. 594 00:38:56,600 --> 00:38:58,166 What about us? 595 00:38:58,300 --> 00:39:00,633 Would we know when to sound the alarm? 596 00:39:00,767 --> 00:39:02,967 Can we see what's coming? 597 00:39:03,100 --> 00:39:05,734 Can we awaken in time? 598 00:39:18,700 --> 00:39:24,734 (buzzing) 599 00:39:29,000 --> 00:39:32,033 TYSON: We're back on the trail of one of our two atoms. 600 00:39:32,166 --> 00:39:34,734 The uranium atom. 601 00:39:37,500 --> 00:39:40,467 A uranium atom is inherently unstable. 602 00:39:40,600 --> 00:39:43,033 Sooner or later, it decays. 603 00:39:43,166 --> 00:39:45,433 A particle from its nucleus breaks away, 604 00:39:45,567 --> 00:39:47,433 transforming the uranium atom 605 00:39:47,567 --> 00:39:49,900 into an entirely different element. 606 00:39:50,033 --> 00:39:52,500 Thorium. 607 00:39:53,066 --> 00:39:57,000 We're flying through the crossfire of radioactive decay. 608 00:39:57,133 --> 00:39:59,133 Subatomic particles move like bullets through the 609 00:39:59,266 --> 00:40:01,433 fine structure of life. 610 00:40:01,567 --> 00:40:04,300 Shearing electrons from their molecules. 611 00:40:04,433 --> 00:40:10,233 This is how ionizing radiation affects living things. 612 00:40:14,533 --> 00:40:17,500 Those chromosomes never had a chance. 613 00:40:17,633 --> 00:40:20,033 This is why atomic weapons are so much more dangerous 614 00:40:20,166 --> 00:40:22,266 than conventional ones. 615 00:40:22,400 --> 00:40:25,867 Ionizing radiation is all around us and even inside us. 616 00:40:26,000 --> 00:40:28,367 At low levels, it poses no threat. 617 00:40:28,500 --> 00:40:31,734 But at higher levels, it's a different story. 618 00:40:33,867 --> 00:40:37,467 In the near term, exposure to lethal levels of radiation can 619 00:40:37,600 --> 00:40:40,400 cause a runaway reaction of the cell that makes it 620 00:40:40,533 --> 00:40:43,300 multiply exponentially. 621 00:40:44,200 --> 00:40:45,734 Cancer. 622 00:40:45,867 --> 00:40:50,967 But its power to harm can also echo down the corridors of time. 623 00:40:52,467 --> 00:40:54,867 When the radiation tore into the chromosomes of the 624 00:40:55,000 --> 00:40:59,133 butterfly, it left a trail of destruction in its wake that 625 00:40:59,266 --> 00:41:03,433 changed the destiny of the butterfly's unborn offspring. 626 00:41:04,600 --> 00:41:07,567 A mutation in its genes. 627 00:41:09,300 --> 00:41:12,033 We have a lot in common with butterflies. 628 00:41:12,166 --> 00:41:15,166 Any change in the DNA architecture will be copied 629 00:41:15,300 --> 00:41:18,767 over and over again in succeeding generations. 630 00:41:18,900 --> 00:41:21,133 The damage is passed on. 631 00:41:21,266 --> 00:41:23,633 Vandalizing our future. 632 00:41:23,767 --> 00:41:27,633 We are made of atoms that were born in stars thousands of 633 00:41:27,767 --> 00:41:32,133 light years away in space and billions of years ago in time. 634 00:41:32,266 --> 00:41:35,467 The search for our own origins has carried us 635 00:41:35,600 --> 00:41:38,433 far from our epoch in our world. 636 00:41:38,567 --> 00:41:41,367 We are star-stuff, deeply connected with 637 00:41:41,500 --> 00:41:43,633 the rest of the universe. 638 00:41:43,767 --> 00:41:47,233 The matter we are made of was generated in cosmic fire. 639 00:41:47,367 --> 00:41:51,800 And now, we, ambulatory collections of seven billion 640 00:41:51,934 --> 00:41:55,233 billion billion atoms intricately assembled over 641 00:41:55,367 --> 00:42:00,100 eons has devised a means to tap that cosmic fire, 642 00:42:00,233 --> 00:42:03,066 hidden in the heart of matter. 643 00:42:03,200 --> 00:42:06,033 We cannot unlearn this knowledge. 644 00:42:06,166 --> 00:42:11,600 And tragically, insanity runs in our family. 645 00:42:21,734 --> 00:42:24,066 The letters that the scientists wrote to begin 646 00:42:24,200 --> 00:42:27,700 this nightmare were followed by another. 647 00:42:27,834 --> 00:42:30,100 This one, a letter to the planet, 648 00:42:30,233 --> 00:42:33,200 stating that this new understanding of physics 649 00:42:33,333 --> 00:42:37,100 demanded a new way of thinking. 650 00:42:37,233 --> 00:42:42,533 "Shall we choose death because we cannot forget our quarrels, 651 00:42:42,667 --> 00:42:47,133 we appeal as human beings to human beings. 652 00:42:47,266 --> 00:42:51,734 Remember your humanity and forget the rest." 653 00:42:57,533 --> 00:42:59,000 And what of our other atom? 654 00:42:59,133 --> 00:43:01,533 The carbon atom? 655 00:43:01,667 --> 00:43:04,800 It's inside one of you. 656 00:43:52,300 --> 00:43:54,266 Captioned by Cotter Captioning Services.