Nine dimensions? If that's true, why can't we see them?

Using a two dimensional representation of the three-dimensional world we all experience, Sixty Symbols provides this explanation for the counter-intuitive conclusion reached in string theory that there are many more dimension than the ones we can see.

While the mathematics behind the theory have often been described as beautiful - I wouldn't know - evidence for its veracity has been hard to come by. But in the past few years, some evidence and at least one experimental approach have been identified.