5Sleeping in a cold room can help you slim down.
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Just a single month of sleeping in a 66-degree room helped increase subjects' fat-burning ability by as much as 10 percent, according to research from Commonwealth University.
6You'll yawn more often than you eat breakfast.
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Over the course of a lifetime, you'll yawn approximately 250,000 times, according to one expert on the subject. If you live to 70, that's about 10 yawns per day.
7You can't breathe and swallow simultaneously.
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"This is because the food and fluids we swallow and the air we breathe in both travel down the same part of our throat," according to registered psychiatric nurse James Steinmetz.
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8Fake smiles can hurt you.
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It turns out that faking happiness can hurt your health. For a 2011 study published in the Academy of Management Journal, researchers looked at the behavior of bus drivers—a profession where people are required to have many friendly interactions throughout the day—and discovered that these people withdraw from their work while putting on a smile for show, and that that could have long-term deleterious health effects.
9Babies don't have kneecaps.
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Well, they do. It's just that they aren't made of bone. They're little bits of cartilage that have yet to ossify into bone. And for more on how to know when kids are being honest, check out 50 Lies Kids Say That Parents Always Fall For.
10The color you see in pitch darkness has a name.
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If you close your eyes in a completely dark room. When you open them, the color you see is called eigengrau, which means intrinsic gray. It's the shade of dark gray people see when there's no light.
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