Foam from frogs' nests could help make bandages that release drugs

A tngara frog (Engystomops pustulosus) Paul Hoskisson
Foam that frogs make to build nests can be used in future pharmaceuticals and cosmetics. It can stay flat for several weeks, doesn't irritate skin, and can slow release drugs for days.

Most natural and synthetic foams, including medical foams and beer foams, are quickly dissolved into liquids by insects, also known as leafhoppers. Some frogs make an incubator foam that protects eggs and tadpoles.