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While there is a myriad of deodorants, shower gels and perfumes helping us stay fresh and fragrant today, that hasn鈥檛 always been the case. How did humans stay clean in the past, or did they not care so much? And is there an evolutionary reason for human body odour in the first place?

These are questions that CrowdScience listener Sarah has pondered on trips in her camper van, when she wants to keep clean, but washing isn鈥檛 always convenient.

In search of answers, presenter Anand Jagatia delves into the sweaty details: where body odour comes from, why some people's armpits don't smell, and whether this heady stink serves any purpose. Could our natural odour really help to attract a partner, or is it just a smelly bacterial by-product?

Anand explores the intriguing mystery of human pheromones, and hears how for hundreds of years, Europeans were terrified of washing.

Contributors:
Dr Madalyn Nguyen, Dermatologist
Dr Kara Hoover, Biological Anthropologist, University of Alaska Fairbanks
Katherine Ashenburg, author, The Dirt on Clean: An Unsanitized History
Dr Tristram Wyatt, Department of Biology, University of Oxford

Presenter: Anand Jagatia
Producer: Sophie Eastaugh
Production co-ordinator: Ishmael Soriano
Editor: Cathy Edwards
Sound engineer: Emma Harth

(Photo: Girl sweating smelly armpit, Taiwan Credit: PonyWang via Getty Images)