TOP TEN UNSOLVED PROBLEMS IN PHYSICS

http://www.oglethorpe.edu/faculty/~m_rulison/top10.htm

“Why does the universe appear to have one time and three space dimensions?

“Just because” is not considered an acceptable answer. And just because people can’t imagine moving in extra directions, beyond up-and-down, left-and-right, and back-and-forth, doesn’t mean that the universe had to be designed that way. According to superstring theory, in fact, there must be six more spatial dimensions, each one curled up too tiny to detect. If the theory is right, then why did only three of them unfurl, leaving us with this comparatively claustrophobic dominion?”

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