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Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Warning: May contain the “m-word”… Tweet this video ⇒ http://bit.ly/OKTBSspit Share on FB ⇒ http://bit.ly/OKTBSspitFB ↓ More info and sources below ↓ Get yourself an awesome IOTBS shirt! http://dftba.com/besmart References/further reading: “Gulp” by Mary Roach: A great read about the odd science of the digestive system http://amzn.to/1U4i2N7 (Public library: http://www.worldcat.org/oclc/811599508) Carpenter, Guy H. "The secretion, components, and properties of saliva."Annual review of food science and technology 4 (2013): 267-276. Perry, George H., et al. "Diet and the evolution of human amylase gene copy number variation." Nature genetics 39.10 (2007): 1256-1260. ---- Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below! Like us on Facebook: / itsokaytobesmart Follow on Twitter: / okaytobesmart / jtotheizzoe Follow on Tumblr: http://www.itsokaytobesmart.com Follow on Instagram: / jtotheizzoe Follow on Snapchat: YoDrJoe ----------------- It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D. Follow me on Twitter: @jtotheizzoe Produced by PBS Digital Studios: / pbsdigitalstudios Music via APM Stock images from SciencePhoto http://www.sciencephoto.com/ and Shutterstock http://www.shutterstock.com Stock footage from Videoblocks (unless otherwise noted) http://www.videoblocks.com