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        Part of Genius by Stephen Hawking
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        Lesson 105: How Long?

        How long has evolution been at work? When did life first begin, and how old is life on Earth? Why not find out with fireworks! Try to comprehend the amazing amount of time life has been around by following Stephen Hawking's volunteers as they follow the spark of life--each firework burst equalling a quarter of a million years. Find out about James Hutton, a geologist and jack of all trades who was one of the first to figure out that the world was much older than originally thought.


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