Do bubbles act like insulation on the surface of your bath?  Will it prevent the need for that toe-burning hot water top up?  Find out in this QotW!  Plus, we ask how solar sails stay aloft on simple sunlight... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

How do solar sails work?

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...