Today’s Wonder of the Day was inspired by Karen from New Castle, VA. Karen Wonders, “Why are yawns contagious?” Thanks for WONDERing with us, Karen!
Yaaaaaaawn. When it comes to yawns, two things are certain: Everybody yawns — and nobody really seems to know why.
We begin yawning very early in life — before we've even entered the world, to be exact. Ultrasounds have discovered that fetuses begin yawning and hiccuping as early as 11 weeks into their development.
Scientists continue to study the “contagious yawn" phenomenon, but they've yet to conclude exactly what causes humans to yawn simply because they see another person yawning. Interestingly, their research has found that, like humans, chimpanzees will yawn when they see another chimpanzee do so.
The next time you get an urge to start a trend, just open up your mouth and yawn. You may be surprised to find the person next to you can't resist the urge to join in, too.