Why Do We Live In Three Dimensions?

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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 nasaimages.org





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