Why does the clear part of the egg turn white when it's cooked?

Have you ever seen an egg cooking on a griddle? When you first crack it, it’s clear and gloopy with a yellow yolk in the middle. But as it cooks, the clear part of the egg turns white! So, what gives? We asked Paul Adams, science research editor at Cook’s Illustrated and America's Test Kitchen, to help us crack this eggy mystery. 

Got an egg-ceptional question?  Send it to us at BrainsOn.org/contact and we’ll scramble to find the answer!