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How to ancient Greeks knew the Earth was round. All you need is sticks, eyes, feet and brains

How to ancient Greeks knew the Earth was round. All you need is sticks, eyes, feet and brains

Video Credits to: u/zortori
< Previous Ever wondered how to determine if the Earth is either flat, or round, and then to calculate its circumference - using only sticks, feet, and brains? Carl Sagan explains how. Guy kicks 4 boards in one go... Next >
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