You know what's funny? Why people laugh. Hank talks about the science of laughter: what makes us laugh, what purpose it serves, and even what it can tell us about our mental and physical health. Hilarious! 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: dftba.com/artist/52/SciShow -- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Sources for this episode: science.howstuffworks.com/life/laughter2.htm news.rutgers.edu/research/serious-question-why-20091014#.UfqhMNLviSo www.nbcnews.com/id/3077386/ns/technology_and_science-science/t/big-mystery-why-do-we-laugh/#.UfqqD9LviSo www.scientificamerican.com/article.cfm?id=ask-the-brains-why-do-we-laugh www.youtube.com/watch?v=4yVE0We52Lc phys.org/news/2011-02-falls.html www.rightdiagnosis.com/sym/laughter.htm#intro www.huffingtonpost.com/2012/09/24/animals-laugh-_n_1900493.html

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