Do we know if a Great Dane meeting a Chihuahua recognises it as another dog? We asked Professor Donald Broom from Cambridge University and Dr Charlotte Duranton to help us sniff out the answer to Dotty's question. Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

What happens to bubbles in space?

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...