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      "title": "Brian Toon on nuclear winter",
      "startTime": 0,
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    {
      "title": "Asteroid impacts ",
      "startTime": 62,
      "endTime": 260
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    {
      "title": "The discovery of nuclear winter",
      "startTime": 260,
      "endTime": 836
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    {
      "title": "Comparing volcanos and asteroids to nuclear weapons",
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      "endTime": 1182
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    {
      "title": "How did life survive the asteroid impact 65 million years ago?",
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    {
      "title": "How humanity could go extinct",
      "startTime": 1505,
      "endTime": 1786
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    {
      "title": "Nuclear weapons as a great filter",
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      "endTime": 2072
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    {
      "title": "Nuclear winter and food production",
      "startTime": 2072,
      "endTime": 2458
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    {
      "title": "The psychology of nuclear threat",
      "startTime": 2458,
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    {
      "title": "Geoengineering to prevent nuclear winter",
      "startTime": 2636,
      "endTime": 2809
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    {
      "title": "Will humanity avoid nuclear winter?",
      "startTime": 2809,
      "endTime": 2959
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}