A quick look at why we hiccup, yawn, get startled awake right as we fall asleep, and more…
[youtube https://www.youtube.com/watch?v=ZE8sRMZ5BCA?rel=0&showinfo=0&iv_load_policy=3&w=685&h=385]
Read more: http://twentytwowords.com/5-weird-things-our-bodies-do-involuntarily-explained/
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