Giraffes have very long necks indeed so how do they go about barfing? We find out how they revisit their dinner. Plus, we ask how the human body keeps warm. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

How do we keep warm?

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...