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Why Do We Live In Three Dimensions?

New Scientist's MacGregor Campbell provides us the rundown on why of all the dimensions, we live in the third one. What is the compact with space's crucial... three-ness? Many of you, particularly those familiar with books like Edwin Abbott's Flatland, will no doubt identify the repetitive silliness in explanations like "we evolved to live in a three dimensional universe, so that's the universe we perceive. If the universe had been two-dimensional then we would also be two-dimensional. Same with four dimensions." This explanation, as Campbell admits, is kind of lame. Luckily, he goes deep in the subject.
Image credit: NASA/courtesy of

More at New Scientist {warning: paywall ahead}

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