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en.wikipedia.org/wiki/Yawn

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the ... In humans, yawning is often triggered by others yawning (e.g. seeing a ... reduced contagious yawning when watching videos of people yawning.

www.webmd.com/brain/news/20110923/why-we-yawn

Sep 23, 2011 ... All humans yawn. So do most vertebrate animals. Surely it serves some useful function. But what that might be has puzzled scientists ...

www.huffingtonpost.com/2013/06/10/facts-yawning-why-we-yawn-contagious_n_3398301.html

Jun 10, 2013 ... The study found that people were more likely to yawn during the winter, when the exterior air is obviously cooler, than in the summer, when ...

www.loc.gov/rr/scitech/mysteries/yawn.html

The act of yawning (oscitation) occurs in almost all vertebrates- even birds and fish exhibit a form of mouth gaping similar to yawning. In humans, yawning can ...

www.smithsonianmag.com/science-nature/why-do-we-yawn-and-why-is-it-contagious-3749674

Jun 28, 2013 ... Humans yawn from their earliest days–even babies still inside the womb can yawn. Photo by Flickr user Björn Rixman. Snakes and fish do it.

www.wsj.com/articles/the-real-reason-we-yawn-1408403897

Aug 19, 2014 ... Scientists working to unravel the mystery surrounding the yawn, and why it's contagious, have discovered that yawning is much more ...

www.pediatriconcall.com/kidscorner/whywhat/Why_yawn.aspx

Kids Corner - Read About Why Do We Yawn On Pediatric Oncall.

kidshealth.org/en/kids/yawn.html

Everybody yawns — from unborn babies to the oldest great-grandparent. Animals do it, too. But why, exactly, do people and animals yawn? No one knows for ...

science.howstuffworks.com/life/inside-the-mind/human-brain/question5721.htm

While fatigue, drowsiness or boredom easily bring on yawns, scientists are discovering there's more to yawning than most people think. Not much is known ...