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Why Don't We Have Elbowcaps?

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Arms and legs are pretty similar, from the amount of bones they have to the way their joints bend, but your legs have one thing your arms don't: kneecaps. Ever wonder why? Hosted by: Michael Aranda ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to James Harshaw, Kevin Bealer, Mark Terrio-Cameron, Patrick Merrithew, Accalia Elementia, Charles Southerland, Fatima Iqbal, Benny, Kyle Anderson, Tim Curwick, Will and Sonja Marple, Philippe von Bergen, Bryce Daifuku, Chris Peters, Kathy Philip, Patrick D. Ashmore, Charles George, Bader AlGhamdi. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: http://www.aofas.org/footcaremd/conditions/ailments-of-the-big-toe/pages/sesamoiditis.aspx https://www.howitworksdaily.com/question-of-the-day-why-do-we-have-a-kneecap-but-not-an-elbowcap/ http://yourfunctionalhealth.com/why-do-we-have-knee-caps-anyway/ http://www.arthritis.org/about-arthritis/where-it-hurts/elbow-pain/elbow-anatomy.php Sophie Regnault and John R. Hutchinson, personal communication

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