# Where did water come from, and why doesn't it go off?

An episode of [Ask the Naked Scientists](https://invisiblenetwork.ai/podcast/287114592), 18 Sep 2026, 17 min.

Audio: https://flex.acast.com/downloads.nakeddiscovery.com/downloads/active/Ask_26.09.18.mp3

Can sensors help keep our roads in good shape? If the Earth is round, why aren't the people at the bottom standing upside down? How efficient is the human body? Why can't periods be controlled like going to the bathroom? Do animals have periods too? Where did water come from in the first place, and why doesn't it go off? Dr Chris Smith and Relebogile Mabotja have the answers. Like this podcast? Please help us by supporting the Naked Scientists

Shows are listed from Apple Podcasts' charts and directory, and Podcast Index where it is used. Every show and episode belongs to its publisher and plays from the publisher's own feed; this site hosts none of them.