New Scientist's MacGregor Campbell gives us the rundown on why – of all the dimensions – we live in the third one. What is the deal with space's essential... three-ness?
Many of you – especially those familiar with books like Edwin Abbott's Flatland – will no doubt recognize the tautological 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 confesses, is kind of lame. Fortunately, he expands on the subject.
For even more details, check out the newly published article by Matthew Chalmers that inspired the video (warning: paywall ahead).