To filter unwanted substances out of the blood, your kidneys contain myriad tiny tubes adding up to about 40 miles in length.
Today, American dentists use some 13 tons of gold each year for crowns, bridges, inlays and dentures. The reason? Gold is non-toxic, it can be shaped easily, and it is tough – it never wears, corrodes, or tarnishes.
Tongue prints are as unique as fingerprints.
Tooth enamel is the hardest substance manufactured by the human body.
Tuberculosis is one of the world's oldest diseases. Some ancient mummies found in Egypt and Peru had tuberculosis.
Turkana tribesmen, who live on the barren soils of the Great Rift Valley in Kenya, add iron to their diet by drinking cow's blood – they puncture the cow's jugular vein with a sharp arrow and catch the spurting liquid in a clay jug. The cows, though bled frequently, suffer no ill effect.
Twenty-five trillion cells travel through the bloodstream – a stack of 500 would only measure 0.04 inches high.
Twins are born less frequently in the eastern part of the world than in the western.
Two hundred beats per minute is the maximum heartbeat possible for a human.
Two out of three adults in the United Sates wear glasses at some time.
Two phobias for the price of one – a person who has an irrational fear of childbirth can be said to be either maieusiophobic or tocophobic.
Type O is the most common blood type in the world. Type AB is the rarest. There is also a subtype called A-H, but to date, only three people in the world are known to have it.
Ulcers seem to be aggravated more by decaffeinated coffee than by regular coffee. The effects of decaffeinated coffee were compared to those of peptone, a product of protein digestion considered the strongest stimulant of acid secretion in the stomach. Analysis of stomach contents by the Center for Ulcer Research and Education in California revealed that drinking decaffeinated coffee produced more gastric acids than that produced by peptone.
Uncontrollable winking is the physical symptom of those suffering from blepharospasms.
Until about age 12, boys cry about as often as girls.
Until the 1920s, babies in Finland were often delivered in saunas. The heat was thought to help combat infection, and the warm atmosphere was considered pleasing to the infant. The Finns also considered sauna as a holy place.
Up to the age of six or seven months, a child can breathe and swallow at the same time. An adult cannot do this.
Varicose veins are stretched, dilated veins whose valves do not work properly. The Arizona Heart Institute & Foundation reports that women are three times more likely to develop them than men, and people whose jobs require them to stand for long amounts of time often develop them.
Visual scientists have estimated that, by the age of 60, our eyes have been exposed to more light energy than would be released by a nuclear blast.
Water makes up 60 percent of our body weight. Of the water, 8 percent is in the blood, 25 percent in the spaces between cells, and 67 percent inside the cells.
|© 2006 The Mine of Useless Information|