1. The colder the room you sleep in, the better the chances are that you’ll have a bad dream.
It isn’t entirely clear to scientists why this is the case, but if you are opposed to having nightmares you might want to keep yourself a little toastier at night.
2. Tears and mucus contain an enzyme (lysozyme) that breaks down the cell wall of many bacteria.
This is to your advantage, as the mucus that lines your nose and throat, as well as the tears that wet your eyes are helping to prevent bacteria from infecting those areas and making you sick.
3. Your body gives off enough heat in 30 minutes to bring half a gallon of water to a boil.
If you’ve seen the Matrix you are aware of the energy potentially generated by the human body. Our bodies expend a large amount of calories keeping us at a steady 98.6 degrees, enough to boil water or even cook pasta.
4. Your ears secrete more earwax when you are afraid than when you aren’t.
The chemicals and hormones released when you are afraid could be having unseen effects on your body in the form of earwax. Studies have suggested that fear causes the ears to produce more of the sticky substance, though the reasons are not yet clear.
5. It is not possible to tickle yourself.
Even the most ticklish among us do not have the ability to tickle ourselves. The reason behind this is that your brain predicts the tickle from information it already has, like how your fingers are moving. Because it knows and can feel where the tickle is coming from, your brain doesn’t respond in the same way as it would if someone else was doing the tickling.
6. The width of your arm span stretched out is the length of your whole body.
While not exact down to the last millimeter, your arm span is a pretty good estimator of your height.
7. Humans are the only animals to produce emotional tears.
In the animal world, humans are the biggest crybabies, being the only animals who cries because they’ve had a bad day, lost a loved one, or just don’t feel good.
8. Right-handed people live, on average, nine years longer than left-handed people do.
This doesn’t have a genetic basis, but is largely due to the fact that a majority of the machines and tools we use on a daily basis are designed for those who are right handed, making them somewhat dangerous for lefties to use and resulting in thousands of accidents and deaths each year.
9. Women burn fat more slowly than men, by a rate of about 50 calories a day.
Most men have a much easier time burning fat than women. Women, because of their reproductive role, generally require a higher basic body fat proportion than men, and as a result their bodies don’t get rid of excess fat at the same rate as men.
10. Koalas and primates are the only animals with unique fingerprints.
Humans, apes and koalas are unique in the animal kingdom due to the tiny prints on the fingers of their hands. Studies on primates have suggested that even cloned individuals have unique fingerprints.
11. The indentation in the middle of the area between the nose and the upper lip has a name.
It is called the philtrum. Scientists have yet to figure out what purpose this indentation serves, though the ancient Greeks thought it to be one of the most erogenous places on the body.