We hack our heads to find out how we can make a secure password. Plus we scrub up the issue and ask: how does self-cleaning glass work? Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

How does self cleaning glass 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...