Why is cotton so fluffy?

Cotton is soft and strong. It comes from cotton plants, and gets turned into everything from t-shirts to cotton balls. But why is cotton so fluffy? We asked biologist Candace Haigler to help us find the answer. Got a question threading through your brain? Send it to us at BrainsOn.org/contact, and we’ll help spin up an answer for you. See omnystudio.com/listener for privacy information.