Listener Henk wrote in to ask "Is lava wet?" Sally Le Page spoke with magmanimous geologist Brooke Johnson from the University of Oxford... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Why do ladybirds have varying spot numbers?

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...