If you take a page of flat notebook and try to stand it up by laying it on its edge on a table it’s nigh impossible. But why does it support itself if you simply add a fold along the middle of the page?
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Paper bends really easily, but it does not stretch easily at all. Bending the paper makes it so that in order to continue bending in the other direction, the paper needs to also stretch (otherwise it would tear). So the paper resists stretching, which has the side effect of resisting bending.
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