Snip: "The reason we do not feel these additional spatial dimensions in our everyday life (if they exist) is because they are very different from the three dimensions we are familiar with. It turns out that it is possible that our world is ‘pinned’ to a 3-dimensional sheet (a so-called ‘brane’) that is located in a higher dimensional space, To illustrate this, imagine an ant crawling on a sheet of paper in your hand. For the ant, the ‘universe’ is pretty much two-dimensional, as it cannot leave the surface of the paper."
What extra dimensions, you probably think, having just read the title. We know very well that the world around us is three-dimensional. We know East from West, North from South, up from down – what extra dimensions could there possibly be if we never see them?
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