26Finger Pruning
Fingers prune underwater not because of them absorbing the water or washing away the oils, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
27. Human fingers can feel objects as small as 13 nanometers. This means that, if your finger was the size of the Earth, you could feel the difference between houses from cars.
28. If you leave the lime juice on your hands on a sunny day, your skin can get second-degree burns and be discolored for years. It’s called “margarita dermatitis” because people often get it while making margaritas outside.
29. Medical doctor Donald Unger cracked the knuckles of his left hand every day for more than 60 years, but he did not crack the knuckles of his right hand. No arthritis or other ailments formed in either hand, earning him the 2009 Ig Nobel Prize in Medicine.
30. “Morning wood” occurs during REM sleep when certain neurotransmitters slow down which normally control blood flow. Morning wood also helps with bladder control at night.
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31Kegels for Men
Kegel exercises can be beneficial for men as well. Men who do Kegels tend to have stronger erections and orgasm. They typically last longer in bed, have an increase in angle of erection and develop increased bladder control.
32. The number of sweat glands you have is directly related to the temperature you experienced as a baby.
33. Humans usually get the urge to pee when the bladder is just 1/3 full. But in zero gravity, the urge doesn’t kick in till the bladder is almost completely full. When John Glenn orbited the Earth, his only urination was measured at 27 ounces, seven ounces more than the capacity of an average human bladder.
34. If kidney cells didn’t have aquaporins, which allow cells to reclaim water from urine, humans would have to excrete about 180 liters of urine per day.
35. You urinate more when you’re cold because of an increase in your arterial blood pressure caused by blood being taken away from your extremities and crammed in your core. Your kidneys shed fluid to try and stabilize it.
