Charles Darwin and the Tree of Life

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David Attenborough asks three key questions: how and why did Darwin come up with his theory of evolution? Why do we think he was right? And why is it more important now than ever before?

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The Miller-Urey experiment was the first attempt to scientifically explore ideas about the origin of life. Stanley Miller simulated conditions thought be common on the ancient Earth. The purpose was to test the idea that the complex molecules of life (in this case, amino acids) could have arisen on our young planet through simple, natural chemical reactions.

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Pouring out of Lake Victoria, the Nile bursts into life, growing vast with sandy banks and mighty rapids. Under the scorching sun, elephant herds leave the savannah to drink and bathe in the river.

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