With thanks to Keay Davidson’s excellent biography, *Carl Sagan: A Life*.

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With thanks to Keay Davidson’s excellent biography, *Carl Sagan: A Life*.

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Further Exploration

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For quantum gravity specialist and author Lee Smolin, Albert Einstein’s greatest strength didn’t lie in numbers.

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Get your fill of pi (videos) to celebrate Pi Day, including great short videos from Hank Green, James Grime, Veritasium and Physics Girl, Matt Parker, and (of course) Perimeter Institute.

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