And of course, eggs!

A hen needs 24 to 26 hours to produce an egg, which weighs about 60g, 10 of which is spent on the shell. The temperature for complete coagulation of the egg white is 70°C and that of the yolk is 85°C. Eggs were used in one of the oldest painting techniques to bind pigments: "tempera" (distemper) in ancient Egypt and in Europe until the Middle Ages.