We’ve heard yawns are contagious, but did you know they could be used to predict your relationship status? According to NPR, if you yawn and your significant other doesn’t yawn back, your relationship might be in trouble.
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A 2011 study by researchers at the University of Pisa observed the yawning pattern of 109 men and women. They discovered yawns are especially contagious with the people you’re closest to — parents, siblings, children.
This inspired science writer Sam Kean to ask this question in his new book, The Tale of the Dueling Neurosurgeons: What if you could tell if someone was falling out of love with you by measuring their yawn delay? If the study's results are accurate, then the more someone is really into you, the shorter their average yawn delay should be.
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