*nods* String theory; currently debating somewhere between 10 and 26 :)
Extra dimensions seem pretty strange because we're used to a 3 spatial, 1 temporal universe.
Explaining an additional dimension is relatively simple. Think of a cube, with North, South, East and West 'walls' (N, S, E, W) and a floor and ceiling (F, C). Now imagine if you would a fourth spatial dimension which allows movement; like an edge between the F and C.
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Extra dimensions seem pretty strange because we're used to a 3 spatial, 1 temporal universe.
Explaining an additional dimension is relatively simple. Think of a cube, with North, South, East and West 'walls' (N, S, E, W) and a floor and ceiling (F, C). Now imagine if you would a fourth spatial dimension which allows movement; like an edge between the F and C.
Check out the 3-d shadow of a similar object...
http://en.wikipedia.org/wiki/Fourth_dimension
... and elaborate from there!