This week we speak with NASA's Planetary Protection Officer to find out if we could, and should, introduce life onto Mars. Plus we ask is a human producing Vitamin D a bit like a photosynthesising plant?..... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Is Vitamin D Production like Photosynthesis?

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...