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Visit to pick the razor for you and use code TANGENTS and you’ll get two years' worth of blades free! A big part of being a human is that you get progressively more gross as the day goes on. Various parts start stinking, hair grows all over your face, you're touching who-knows-what... luckily for all of us, someone a long time ago decided to invent hygiene! Otherwise we'd have to lick ourselves like cats!SciShow Tangents is on YouTube! Go to to check out this episode with the added bonus of seeing our faces! Head to to find out how you can help support SciShow Tangents, and see all the cool perks you’ll get in return, like bonus episodes and a monthly newsletter! A big thank you to Patreon subscribers Garth Riley and Glenn Trewitt for helping to make the show possible!And go to to buy some great Tangents merch!Follow us on Twitter @SciShowTangents, where we’ll tweet out topics for upcoming episodes and you can ask the science couch questions! While you're at it, check out the Tangents crew on Twitter: Ceri: @ceriley Sam: @im_sam_schultz Hank: @hankgreen[Definition] History of hygiene [Trivia Question] Pelagic thresher sharks visit blue-streaked cleaner wrasse stations [Fact Off] Bronze Age ivory lice comb with Canaanite language Tampon Task Force & menstrual hygiene [Ask the Science Couch] Antiperspirant aluminum compounds - how they work & are they harmful [Butt One More Thing] Mandrills teach their children hygienic behaviors to avoid peri-anal parasites
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