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Anxiety is good for health

16.12.2016

Excitement gives the human body much more positive effects and is even beneficial, scientists from the University of California, USA are convinced.

According to experts, when feeling anxious, a person expresses his emotions and does not lock them in himself. Experiencing people, it turns out, are much better prepared for news of various kinds.

The study of scientists involved young people who graduated from universities. The experts analyzed their behavior and feelings before passing the exam tests, during the exams and after.

The surveys revealed three behavior strategies for graduates: detach from reality, have a positive attitude towards what is happening, and also worry about waiting for results. It turned out that the latter strategy implies that the student is internally prepared for the worst case scenario, but hopes for the best.

Scientists recognized the first strategy as ineffective, and the third, respectively, as the most effective.

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Prosthetic arm rocket engine 28.10.2007

US engineers have adapted a rocket engine for a prosthetic arm.

"We have created an artificial hand that resembles a human hand much more in its work and strength than all existing prostheses. In addition, it weighs about the same as a human hand," says Professor Michael Goldfarb from Vanderbilt University, leader of the work. (USA).

Until now, prosthetic arms have run on batteries - their energy was enough to provide a limited set of functions. However, for a complex hand that could, for example, move its fingers, the battery turned out to be weak.

Therefore, scientists from Goldfarb's group decided to adapt a rocket engine for the prosthesis. This was done by specialists from Johns Hopkins University - the engine became the size of a pencil. And it works on hydrogen peroxide, which decomposes with a catalyst. The result is pressure that opens and closes a series of valves, and the hand and fingers move. A small vessel of fuel, which is placed in the forearm, is enough to power an artificial arm for 18 hours.

When creating the hand, two problems arose. The first is warmth. They coped with it by covering the hottest parts with special plastic. The second is the exhaust: when the peroxide decomposes, water is obtained, which must be put somewhere.

The authors of the work applied an ingenious solution: water passes through a porous surface, and its amount approximately corresponds to the volume of sweat emitted by a human hand.

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