The shape of the coin, on the other hand, hasn’t changed. It’s still a dodecagon, or 12-sided shape. We’ve written before at HuffPost UK about why we call a pound a “quid.” But why does ...

The rectangle is a wobbly, unstable shape. When you push the side, it flops into a slanted parallelogram. This happens without any of the rectangle's sides changing length. When you poke the top ...