On 26/07/2013 05:16 AM, clipka wrote:
> String theory postulates that there are indeed - AFAIR - about half a
> dozen extra dimensions, and it is suggested that they may indeed all be
> curled up in this manner, with sizes roughly on the scale of sub-atomic
> particles.

More fully: Some formulations of string theory suggest that the universe 
has as many as 11 spatial dimensions. The obvious question is then "so 
why can't I see any of them?", and the only answer anybody has come up 
with is "well, maybe they're really tiny..."

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