How do snails make their shells?

Have you ever seen a snail sliming along, eyestalks a-waving, carrying its whole house on its back? What are snail shells made of, anyway? And how do they make them? We asked biologist Teresa Rose Osborne to help us find the answer. Got a question that’s been creeping around your brain? Send it to us at BrainsOn.org/contact, and we’ll escar-GO find you the answer! See omnystudio.com/listener for privacy information.