Step 9: Finally, compare the egg in water. The surface of the shell should be drastically different to the other eggs in the experiment.

An experiment with an egg left in vinegar demonstrates how our teeth our softened by the acid created by sugar, and why brushing our teeth is important. This short film is from the BBC series ...

To pip, the eaglet must use its tooth. "The eaglets have something called an egg tooth and it's a little kind of nub on their beak, and they use it to push through the egg," Handel said.