We find out if foetuses get cancer, 15 yr old Louis from London got in touch asking: their cells divide rapidly, so surely they can make genetic errors and get cancer? Plus we ask, how do touch sensitive gadgets work? Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

How do touch sensitive switches 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...