Mark got in touch to find out how noise cancelling headphones work. Can they damage your ears by playing back loud background noise? Fanny Yuen spoke to Trevor Cox to cut the rumble... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

How do octopus camouflage?

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...