How we determined the earth was round thousands of years ago
These days, the idea that the Earth is round is common sense, but it wasn’t always this way. Watch as Carl Sagan explains how the ancient Egyptians were able to determine that the Earth wasn’t flat thousands of years ago.
Read more: http://www.wimp.com/how-we-determined-the-earth-was-round-thousands-of-years-ago/
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