Why are tattoos permanent?

What happens when you mix bleach and ammonia? Why does perfume smell amazing on one person and weird on another? And why is getting a job so hard right now? This week we’re answering a huge batch of listener questions about chemistry, sunscreen, scents, books, careers, birds, and ...  Show more

How do you turn a weird cloudy liquid into something stronger than steel? This week we’re telling the story of Kevlar: the chemistry breakthrough that led to bulletproof vests, firefighter gear, reinforced tires, and so much more. Along the way we talk polymers, hydrogen bonding, ...  Show more