Check out Lumerit: http://lumerit.com/brainfood If you happen to like our videos and have a few bucks to spare to support our efforts, check out our Patreon page where we've got a variety of perks for our Patrons, including Simon's voice on your GPS and the ever requested Simon Whistler whistling package: https://www.patreon.com/TodayIFoundOut This video is sponsored by Lumerit. →Some of our favorites: https://www.youtube.com/playlist?list=PLR0XuDegDqP10d4vrztQ0fVzNnTiQBEAA →Subscribe for new videos every day! https://www.youtube.com/user/TodayIFoundOut?sub_confirmation=1 Never run out of things to say at the water cooler with TodayIFoundOut! Brand new videos 7 days a week! The short answer as to why some people bite their tongue when concentrating is that the tongue requires a surprising amount of brain power to manage- beyond general motor control, it’s covered in various types of sensors constantly providing feedback to your brain about what’s going on in your mouth and making sure your teeth aren’t mashing the tongue. Want the text version?: http://www.todayifoundout.com/index.php/2016/03/people-bite-tongues-theyre-concentrating/ Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2099302/ http://www.sciencedirect.com/science/article/pii/S0010027715000840 http://jshd.pubs.asha.org/article.aspx?articleid=1782911 http://www.grammarly.com/blog/2015/14-expressions-with-crazy-origins-that-you-would-never-have-guessed/ http://www.phrases.org.uk/bulletin_board/55/messages/804.html http://thebrain.mcgill.ca/flash/d/d_10/d_10_cr/d_10_cr_lan/d_10_cr_lan.html http://www.phrases.org.uk/meanings/cat-got-your-tongue.html http://www.devcogneuro.com/Publications/motor_%26_cog_paper.pdf http://www.etymonline.com/index.php?allowed_in_frame=0&search=bite+your+tongue http://www.scilearn.com/blog/early-fine-motor-skills-cognitive-skills http://www.opensourceshakespeare.org/views/plays/play_view.php?WorkID=henry6p2&Act=1&Scene=1&Scope=scene htt