We ask why the New World wasn't technologically as advanced as the Old World. Is this a valid question? Plus, we ask what the benefits of kissing might be. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Is there an evolutionary benefit to kissing?

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...