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To drink or not to drink

02.05.2004

As soon as doctors began to say that moderate regular alcohol consumption improves the condition of the heart and blood vessels, it turned out that it harms the brain, and in addition - the blood vessels.

Employees of a psychiatric clinic at the University of the German city of Erlangen found that alcohol disrupts the processing in the body of the amino acid homocysteine, which is harmful to nerve cells. It is obtained in the process of metabolism as an intermediate product and is soon processed into harmless compounds. But alcohol blocks this transformation, and homocysteine ​​gradually accumulates in the brain tissue.

Occasional and infrequent drinking raises homocysteine ​​levels only slightly, but drinking regularly, even in small amounts, damages nerve cells. In addition, homocysteine ​​makes the walls of blood vessels looser, rougher, and then cholesterol plaques are more easily formed on them.

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Supersonic aircraft without a windshield 12.10.2021

Supersonic aircraft have one significant problem: they make an unbearably loud sound when flying. When an aircraft travels faster than the speed of sound, shock waves are generated. Moving away from the aircraft, merging and generating new sonic booms, they are carried for many kilometers. NASA engineers found a solution, and therefore equipped the X-59 supersonic aircraft not only with a system that reduces sonic booms - Quiet SuperSonic Technology (QueSST) - but also abandoned windshields.

The new X-59 single-seat aircraft (30 m long and 9 m wide) will be able to climb to a height of 16,7 km and move at a speed of Mach 1,4, or 1488 km/h. At the same time, it will be possible to pilot it for lack of a windshield. It will be replaced by NASA's eXternal Vision (XVS) system.

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