Carl Sagan on the Brilliance of Ancient Greek Scientist Eratosthenes - GreekReporter.com
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A wonderful clip of humanist and cosmologist, Carl Sagan, on the Greek Polymath, Eratosthenes, and his endeavour to measure the circumference of the Earth. In doing so, Eratosthenes proves the Earth's curvature, over 2200 years ago. | Humanists UK
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