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BLOOD
In one year the average human heart circulates from 770,000 to 1.6 million gallons of blood through the body, enough fluid to fill 200 tank cars, each with a capacity of 8,000 gallons. That's 4000 gallons of blood each day. The heart creates enough pressure to squirt blood 30 feet (9 m). Blood travels 60,000 miles (96,540 km) per day on its journey through the body.
LIPS
Human lips have a reddish color because of the great concentration of tiny capillaries just below the skin. The blood in these capillaries is normally highly oxygenated and therefore quite red. This explains why the lips appear pale when a person is anemic or has lost a great deal of blood. It also explains why the lips turn blue in very cold weather. Cold causes the capillaries to constrict, and the blood loses oxygen and changes to a darker color.
SEXUAL PEAK
Men reach the peak of their sexual powers in their late teens or early twenties, and then begin a slow decline. Usually they are past their sexual prime by their late forties. Women, on the other hand, do not reach their sexual peak until their late twenties or early thirties, and they remain at this level through their late fifties or early sixties.
HARD ROCK
Experiments conducted at several college laboratories demonstrate that hard rock music played to colonies of termites cause the insects to enter a kind of frenzy and to chew through wood at twice their normal rate.
Paper money developed in Europe in the following manner. During the Middle Ages it was customary for wealthy families to store their gold, jewels, and coins in vaults kept in the cellars of goldsmiths' shops. The goldsmiths gave written receipts for all valuables received, and these articles could be redeemed with the receipts at any time. Eventually the receipts themselves were being used as Currency by those who didn't want to take the trouble to go to the vault every time they needed money, and businesses throughout Europe began accepting them as readily as gold. The practice gradually spread: paper money became a common form of legal tender, and its use contributed to the establishment of the banking system, which was in full swing by the sixteenth century.
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