Martin wanted to know why fresh pasta rises to the surface of the pot when it's ready. We asked Dr Chris Brock from London South Bank University. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Is it better to walk or run in the cold?

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...