ARFE GM

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.

ARFE GM Cats can rotate their ears 180 degrees.

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.

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.

"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.

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.

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.

Sleeping with your doors closed will help protect you from smoke and toxic fumes in the event of a fire. And for more information on how to rest better at night, check out these 50 Tips for Your Best Sleep Ever.

If you're feeling a bit on the short side, measure yourself when you first wake up. According to Jamaica Hospital Medical Center, This phenomenon may be due to gravity compressing cartilage in our spine and in other parts of our bodies, such as our knees when we stand up or sit down throughout the day. "While we are lying down in a resting position, the spine is said to "spread out" or decompress, so when we wake in the morning we are taller after lying in bed all night."

Assuming you want to tip 20 percent for good service, move the decimal point one digit to the left and then double that number. It's that easy! For example, if a bill is for $35.50, you move the decimal to the left, which gives you $3.55. Double that number, and you've got $7.10—a 20 percent tip calculated in seconds

Believe it or not, that little ball of cotton that comes in your bottle of pills, which is there to keep pills safe during shipping, is meant to be removed. It can collect moisture because of its absorbent nature, which makes your pills deteriorate faster.

In terms of development, the first year of a cat’s life is equal to the first 15 years of a human life. After its second year, a cat is 25 in human years. And after that, each year of a cat’s life is equal to about 7 human years.