worker honey bee stinger thick skin abdomen

Imagine choosing an object at random from a collection. If you can prove there is even a tiny chance it has a certain property, then at least one such object must exist. You might have no idea which one it is. Mathematicians use this trick to prove existence without constructing a single example.

In rural Afghanistan, people make containers called kangina from mud and straw and seal fresh grapes inside. The container controls moisture and the movement of gases well enough to preserve the grapes for up to six months without refrigeration.