We find out if and how plants might combat little nasties like bacteria and viruses. Plus, we ask what defines the frequency of ocean waves. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

What dictates the frequency of the waves?

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...