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the keys on a PC keyboard are not in alphabetical order?

The keyboard of the PC and typewriters are called western "qwerty", the first six letters placed in the top left corner. The provision character was decided in 1872 the same inventor of the typewriter, Christopher Sholes. It seems that the provision had been determined to prevent the auction of the letters used more if they could interbreed with each other jokes about the same time or within walking distance of each other. The strange fact order prevents a write too fast.
speed record. With the birth of the first electric keyboards, he tried to improve the layout of keys. The most famous attempt dates back to 1930 by August Dvorak and speed up writing drew the most commonly used letters of the English in the center line, so the left hand less tired and weak fingers. In
European countries, the provision of the first six letters in the upper left corner is slightly different: in Italy it is replaced with z w (qzerty): typewriters and old Macintosh have that order, while the PC adopted the U.S. keyboard.

source: focus.it

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Because many migratory birds when they take the flying V formation?

This unique phenomenon has been a mystery for a long time: ethologists and researchers have so far tried to interpret it with two different theories .
According to the first, fly in the characteristic V formation allows the birds to reduce the impact aero. Each animal in fact creates a wake that is exploited by volatile following to reduce friction, and then move forward with less effort, a bit 'as it happens in racing when a driver uses the wake of the preceding car to earn some' speed .
The second explanation suggests instead that the migration to take this special training planes slightly offset to each other, to enjoy the best view ever.

Computer simulations
A computer model developed by Valmir Barbosa and Andre Nathan University of Rio de Janeiro has combined these two opposing theories, leading to interesting results. The computer has created a flock of birds 15:35: he is then asked to place each bird so that everyone could stay in touch with his neighbor, but in such a position that allowed him to be completely free viewing.
The model proposed as the best solution to their delta formation is used by many migratory birds such as wild ducks. Subsequent simulations showed that the final result depends on the initial position of the birds.
Computer models developed at the same time in the past that did not consider the two theories had never come to define any patterns in nature actually adopted by birds.

source: focus.it

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Why do women have only two breasts, while other animals more? The many

Women have two breasts because they generally feed on only one child at a time. In other mammalian species, however, number and shape of breasts vary depending on the number and needs of children.

In rare cases, some women have one third breast. In practice this is an extra breast under the left breast. It was once a sign of great beauty. The third sinus is present in 0.4 percent of British women and 5 of the Japanese. What is the reason for this "intrusion"? Maybe because in the distant past our ancestors had more breasts.
matter of degree. The breast of women's size vary. There are traditional rules covered by the plastic surgeons. In the ideal within the breasts should have the same size, same height and same type of attachment. Between the second and seventh rib, should have a teardrop shape and a volume of between 150 and 350 cc.
Natural Tits. The breasts are bigger than the blue whale. There are two (because, as men usually give birth to a child at a time), hidden under a layer of fat, measuring 2.4 meters by 50 centimeters and can deliver up to 72 liters of milk per day that are "fired" directly from the nipple in the baby's mouth.
The most numerous are those of Tenrec, an insectivore of Madagascar that resembles a hedgehog. It has 12 pairs. The smallest are those of the Shrew: measure 2 mm. The strangest, finally, are those of the platypus: they are not breast glands. The milk comes from the pores and hair that runs down the little lick.


source: focus.it