Are  there more grains of sand on Earth or stars in the sky, and who counted  them? We search heaven and Earth to answer Jeff's question, recruiting  astronomer Michael Merrifield from Nottingham University to help out... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Do wild animals get allergies?

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...