The most annoying sound to the human ear has been determined. Free Technical Library News

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The most annoying sound to the human ear

24.07.2020

NASA experts have found out which sound is most capable of annoying a person. The conclusions were preceded by a series of experiments. Scientists recorded the hum of cars and the noise of a flying drone, and had 38 volunteers listen to them.

The researchers note that the study participants never had hearing problems. Volunteers had to rate how much these noises are capable of irritating them.

It turned out that the sound of a flying drone turned out to be the most unpleasant and irritating for the human ear. The fact is that the hum of cars for a person turned out to be more familiar due to the fact that people encounter it every day. As for drones, they are just beginning to penetrate into the daily life of modern people.

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Researchers at the Massachusetts Institute of Technology (MIT) have created a technology that allows you to change the characteristics of an object after it has been printed on a 3D printer.

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The technology was called "living polymerization", with its help, scientists were able to create materials whose growth can be suspended, and eventually resume it. When exposed to ultraviolet radiation, a chemical reaction occurs inside the materials, which leads to the release of free radicals. These free radicals combine with other monomers to increase the size of the object. However, initially the reaction was uncontrollable and caused damage to the item.

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