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March 30, 2017

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Earth and Venus are so similar in size and overall composition that they are almost “twins.” Why did these two planets evolve so differently? Why is Earth's atmosphere rich in oxygen and poor in carbon dioxide, whereas the reverse is true on Venus? What would happen to Earth's oceans if Earth were a little bit closer to the Sun?


What might have happened to mammals if the end-of-Cretaceous extinction had not wiped out the dinosaurs?

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