The human body, it turns out, is surprisingly good at making stone. Give it enough time and the right conditions and it will go about crystallising minerals, hardening secretions and, in rare cases, turning tragedy into rock. Gallstones. Kidney stones. Tonsil stones. Salivary stones. And, in one of the strangest and saddest corners of medical history, stone babies.

In our second episode, hosts Katie Edwards, a health editor at The Conversation, and Dan Baumgardt, a practising GP and lecturer in health and life sciences at the University of Bristol, take a tour through the stony side of human anatomy and ask why this keeps happening, where these stones form and which ones you actually need to worry about. They talk to Adam Taylor, a professor of anatomy at Lancaster University, who has spent years studying stones in both everyday and extraordinary contexts, including a rare genetic condition called alkaptonuria

Strange Health is a podcast from The Conversation is an independent, not-for-profit news organisation. If you like the show, please consider donating to support our work. You can sign up here for a free daily newsletter from The Conversation here.

Hosts: Katie Edwards and Dan Baumgardt

Executive Producer: Gemma Ware

Editing and mixing: Sikander Khan

Artwork: Alice Mason

• Stone baby: the rare condition that produces a calcified foetus
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• Bubble tea’s dark side: from lead contamination to kidney stones