Eye circles plague many of us at one time or another. Some of us have them all our lives! But what causes them? We have the answers... or a few of them. Plus, we ask if giraffes find it tricky to vomit... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

How do giraffes vomit?

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...