Our question this week concerns caves - we find out if more carbon dioxide in the atmosphere causes caves to grow quicker.  Could an acidic atmosphere create cathedral-sized caverns? Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Dirty Hair Grows Slower?

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...