Bob Kenworthy

Polytetrafluoroethylene—also known as Teflon—is slippery, water resistant, stable at high temperatures, and used in hundreds of ways in everything from fabrics to frying pans. Today's Please Explain is all about Teflon—what it's made of, how it works, and the safety concerns about it. Bob Kenworthy, a chemist who, after working for four decades in the chemical industry, now works at the Chemical Heritage Foundation, joins us.