Comment Re:Real problem? (Score 1) 107
Oyster shells are ground up and fed to chickens as a source of calcium. Chickens need a lot of calcium to keep laying eggs every day, and if they get deficient, they can lay the eggs with thin or even no shells.
Actually, I wouldn't be too surprised if they actually used them in human calcium supplements as well. (I have no idea if they do, but it would seem reasonable.)