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Can’t comprehend the 4th dimension? Carl Sagan explains it with an apple in this classic clip.
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upworthy.com
45 years ago, Carl Sagan beautifully explained the fourth dimension with just an apple
45 years ago, Carl Sagan beautifully explained the fourth dimension with just an apple
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upworthy.com
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Carl Sagan once easily debunked flat Earthers with just a piece of cardboard
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