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Yawning is thought to cool the brain and make it more alert. Simultaneous yawning may occur when a group of people are all breathing the same warm, stale air. Or contagious yawning may have evolved to help groups remain vigilant against danger.

en.wikipedia.org/wiki/Yawn

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the ... This "contagious" yawning has also been observed in chimpanzees, dogs, cats, birds, and reptiles, and can occur across species. Approximately 20 ...

www.psychologytoday.com/blog/the-athletes-way/201403/why-is-yawning-so-contagious

Mar 16, 2014 ... About half of adults yawn after someone else yawns due to a universal phenomenon called “contagious yawning.” Researchers at Duke ...

mentalfloss.com/article/64654/why-is-yawning-contagious

Jun 30, 2017 ... What is yawning? And why do we do so much of it? Neuroscientist and yawn expert Robert Provine says it's "ancient and autonomic." It stems ...

time.com/4801522/is-yawning-contagious

Jun 8, 2017 ... The phenomenon of contagious yawning doesn't mean you need more sleep. But it might signal that you're attuned to the emotions of others.

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

Jun 28, 2013 ... Pinpointing exactly why we yawn is a tough task, but the latest research suggests that our sleepy sighs help to regulate the temperature of our ...

www.seeker.com/why-is-yawning-contagious-1765108386.html

2 days ago ... Contagious yawning gets at the ancient, deep, and subconscious roots of empathy and social bonding.

www.washingtonpost.com/news/speaking-of-science/wp/2016/10/03/dear-science-is-yawning-really-contagious

Oct 3, 2016 ... What's the point of yawning, and why is it contagious? Could yawning along with my officemate make me feel more tired? Here's what science ...

science.howstuffworks.com/life/inside-the-mind/human-brain/question5722.htm

Interestingly, while all vertebrates (including fish) yawn, only humans, chimps and possibly dogs find yawns contagious. And people don't find them contagious  ...

news.bbc.co.uk/1/hi/magazine/6270036.stm

Jul 5, 2007 ... Rather than being a precursor to sleep, yawning is designed to keep us awake, say US researchers. But why does seeing someone else yawn ...