Listener Robert asks: "does household composting release fewer greenhouse gases compared to a landfill?" Phil Sansom dug him up an answer, with help from environmental engineer Sintana Vergara... Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

Why are sperm made below body temperature?

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...