Surface tension is crazy. Did you ever do that experiment in elementary school where you filled a glass with water and then started dropping more water on top, bit by bit, with an eyedropper? You watched in amazement as the water, rather than pouring over like you expected, built into a kind of bubble above the cup. But touch that dome – break the surface tension – and over it flowed. How cool is that? Well, I think it’s pretty cool.