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The human spinal cord reaches its full length by the time you are 4 or 5 years old.
The human stomach lining replaces itself every three days.
The human tongue registers bitter tastes 10,000 times more strongly than sweet tastes.
The human tongue tastes bitter things with the taste buds toward the back. Salty and pungent flavors are detected at the middle of the tongue, sweet flavors at the tip.
The hydrochloric acid of the human digestive process is so strong a corrosive that it easily can eat its way through a cotton handkerchief, and even through the iron of an automobile body. Yet, it doesn't endanger the stomach's sticky mucus walls.
Women blink nearly twice as much as men.
The hyoid bone in the throat is the only bone in the human body not joined to another.
Women manufacture far less serotonin, the key mood-regulating brain chemical than men. This could explain why they're more likely to suffer from certain psychological problems such as depression.
The hypothalamus is responsible for controlling body heat, water, and the feeling of hunger. It also wakes you up and causes aggression.
Women navigate by landmarks and visual memories. Men navigate by direction and distance, and tend to be better at reading maps.
The indentation in the middle area between the nose and the upper lip is called the philtrum. Ancient Greeks considered this to be one of the body's most erogenous zones.
Women reject heart transplants more often than men.
The iris of the human eye provides better identification than a fingerprint. A scan of the iris has 256 different unique characteristics. A fingerprint has only 40.
Woven into a rope, the hair on one human's head could support about 12 tons.
The iris, the colored portion at the front of the eye, consists of two sheets of smooth muscle with contrary actions: expansion and contraction. These muscles are in charge of the size of the pupil and determine how much light reaches the sensory tissue of the retina. Without the iris, the pupil would be in a fixed position whether in dark or light.
Wrinkles occur when the collagen supporting the skin stretches and loosens. The ultraviolet light found in sunlight speed up the slackening of collagen, so exposed areas wrinkle faster.
The Ketchua Indians of the Andes Mountains in South America have 2 to 3 more quarts of blood in their bodies than people who live at lower elevations.
You blink every 2 to 10 seconds. As you focus on each word in this sentence, your eyes swing back and forth 100 times a second; every second, the retina performs 10 billion computer-like calculations.
The kidney consists of over 1 million little tubes, and the total length of the tubes in both kidneys runs to about forty miles.
You can't kill yourself by holding your breath. At worst, you would lose consciousness and the lungs would start to breath automatically.
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