Get a piece of chewing gum, chew it for a bit and then take it out of your mouth and stretch it. As it gets longer, the gum will get thinner and thinner. This happens with all kinds of materials from rubber to steel. But not all materials get thinner when you stretch them. There [...]

This is a geomagic square. If you take the shapes in any row, column or main diagonal, you can rearrange them to make a rectangle that is 3 squares tall and five squares wide. Over 2500 years ago, Chinese mathematicians discovered a grid of numbers with special properties that we now call a magic square. [...]