String theory predicts that the Universe may consists of additional spatial dimensions to the three dimensions we are all familiar with.
The theory goes that we cannot observe these additional spatial dimensions in our daily life because these are extremely tiny (much smaller than the size of an atom nucleus) and curled up.
But why should it be so?
I remember when Carl Sagan described in his television series Cosmos how it would be strange for beings, confined to live in a two dimensional space, to be transported into a third dimension and come back to their familiar 2D world.
So we could be confined to our 3 dimensions and be completely unaware of a 4th extended spatial dimension.
Of course the obvious questions would be - why are we confined to 3 dimensions only?
Would additional spatial dimensions necessarily need to be tiny and curled up?
Are we flatlanders in a higher dimensional universe?
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