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Aggression is written on the face

21.11.2008

Physiognomy, the science of the correspondence of a person's appearance to his character, popular until the end of the XNUMXth century, seems to be able to be revived.

Canadian anthropologists measured the ratio of face width to height in photographs of professional hockey players, and then compared the result with the number of minutes spent by the corresponding player on the penalty box for being too aggressive.

It turned out that hockey players with more rounded, broad faces are more likely to abuse power techniques. This pattern was also confirmed in students who were asked to play a computer game that provoked aggressive behavior. But such a connection was not found among the female students who played. The Canadian women's hockey team does not have it either.

The reasons for the pattern found are not very clear, but they suggest that it is due to the action of the male sex hormone - testosterone, which is responsible for both the level of aggressiveness and some physical traits of a man.

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Random news from the Archive

Humpback whales will teach helicopters to fly 26.02.2012

The unique features of humpback whales could improve the aerodynamics of helicopters.

Modern helicopters could be much faster and more maneuverable, at least the current engines can significantly improve the performance of rotorcraft. Unfortunately, during forward flight or maneuvering, the airflow over the rearward-moving rotor blade separates and results in what is known as dynamic stall. This turbulence reduces lift and places heavy loads on the rotor blades and hub, potentially causing a plane crash.

Fortunately, scientists from the German Aerospace Center (DLR) have found a way to overcome this fundamental disadvantage of rotorcraft. It sounds strange, but the way to improve the aerodynamics of helicopters was suggested to scientists by humpback whales. These marine mammals develop great speeds under water and are capable of performing dizzying acrobatic stunts. The secret of their mobility lies in the unusual pectoral fins, which have special tubercles along the leading edge. The tubercles delay the stall moment and increase the whale's maneuverability.

DLR specialists were able to copy the tubercles of the whale and, based on them, make similar designs on the surface of the propeller blades. The artificial bumps, called advanced vortex generators (LEVoGs), are smaller than similar bumps on humpback whales and are 6mm in diameter and weigh just 0,04 grams.

During the first tests of the new technology, 186 LEVOGs were applied to all four blades of a Bo-105 helicopter. A successful wind tunnel test and first test flights have recently taken place. Test pilots have already noticed a difference in the behavior of the blades and a thorough study of the behavior of the upgraded propeller lies ahead.
According to the developers, the new technology has great potential and can increase the speed and maneuverability of helicopters at minimal cost. In mass production, bumps can be formed directly on the leading edges of the titanium blades.

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