When standing barefoot in water, we don't feel the water pressure on our feet. But when wearing Wellington boots, we do feel a pinching - why? We asked Colm-cille Caulfield, Professor at Cambridge University, to help us wade through the science of Daniel's question... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Is second hand smoke more dangerous than smoking a cigarette?

Each week we set out to solve one of the world's weirdest, wackiest, funniest and funkiest scientific puzzles. And along with the answer there's a brand new question to think about for next time...