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People Trivia

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While 7 men in 100 have some form of colorblindness, only 1 woman in 1,000 suffers from it. The most common form of color blindness is a red-green deficiency.

The human brain is grayish pink in color and has a texture much like tofu.

One-fourth of the people who lose their sense of smell also lose their desire for sexual relations.

While calcium is important to strengthen bone, 99 percent of the body's calcium is contained in teeth.

The human brain is insensitive to pain. The suffering of a headache come not from the organ itself but from the nerve and muscles lining it.

Only about 10 percent of the air in the lungs is actually changed with each cycle of inhaling and exhaling when an at-rest person is breathing, but up to 80 percent can be exchanged during deep breathing or strenuous exercise.

The human brain makes up 2 percent of the body's total weight, but uses up 20 percent of the body's oxygen supply.

Only one person in two billion will live to be 116 or older.

The human brain reaches its maximum weight at age 20 - about 3 pounds. Over the next 60 years, as billions of nerve cells die within the brain, it loses 3 ounces.

Our hands are recognized by medical professionals as a major source for spreading flu and cold germs. Flu and cold germs can be spread on computer mice and keyboards, chewed pencils, telephones, pens, salad-bar tongs, light switches, door knobs, taxi door handles, and countless other common objects. People can't avoid touching things. To minimize infection, concentrate on keeping hands away from the mouth, nose, and eyes unless the hands are first washed with antibacterial soap, says the Soap and Detergent Association of New York.

Our nails grow at 0.1 mm per day. It takes about three months to replace one entire fingernail.

Over the many centuries of living in the Arctic, Eskimos' bodies have adapted to the cold. Eskimos tend to be short and squat, which brings their arms and legs closer to the heart, so there is less danger of freezing. Extra fat around the torso protects their internal organs from the cold. The metabolism of Eskimos is also set a little higher than other people's. As a result, they burn their food faster to stay warm. Their veins and arteries are also arranged to carry more warming blood to their hands.

While examining urine, German chemist Hennig Brand discovered phosphorus.

While reading a page of print, the eyes do not move continually across the page. They move in a series of jumps, called "fixations," from one clump of words to the next.

Whispering is more wearing on your voice than a normal speaking tone. Whispering and shouting stretch the vocal cords.

The human brain undergoes 100,000 chemical reactions every second.

The human ear can distinguish more than 1,500 different musical tones.

The human eye is continuously but imperceptibly moving. Muscle contractions cause it to quiver 30 to 50 times per second.

Pain from any injury or illness is always registered by the brain. Yet, curiously, the brain tissue itself is immune to pain; it contains none of the specialized receptor cells that sense pain in other parts of the body. The pain associated with brain tumors does not arise from brain cells but from the pressure created by a growing tumor or tissues outside the brain.

The human eyes can perceive more than 1 million simultaneous visual impressions and are able to discriminate among nearly 8 million gradations of color.

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