Have you ever wondered why we cry? In today's episode of SciShow, Hank gives us the answer, covering different types of tears and whether we are the only species to get all teary eyed during the final scene of a good movie.
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Sources:
http://www.psychologytoday.com/blog/animal-emotions/201309/do-elephants-weep-emotional-response
http://www.epjournal.net/wp-content/uploads/ep07363370.pdf
http://www.theglobeandmail.com/life/health-and-fitness/health/conditions/why-do-we-cry-when-were-happy/article599605/
http://epjournal.wpengine.com/wp-content/uploads/EP075256.pdf
http://www.huffingtonpost.com/2013/02/04/why-do-we-cry-when-were-sad_n_2583885.html
http://www.brainpickings.org/index.php/2012/09/07/curious-behvaior-provine/
http://io9.com/do-tears-of-grief-look-different-from-onion-tears-under-1470513468
http://www.sharecare.com/health/eye-vision-health/different-types-of-tears
http://chemistry.about.com/od/chemistryfaqs/f/onionscry.htm
http://science.howstuffworks.com/life/crying1.htm
http://www.huffingtonpost.com/2014/01/10/tear-facts_n_4570879.html
http://www.ncbi.nlm.nih.gov/pubmed/4062644
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