Why is deodorant so much less popular in East Asia than in Europe? Detailed answer

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Why is deodorant so much less popular in East Asia than in Europe? Detailed answer

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Why is deodorant so much less popular in East Asia than in Europe?

There are two versions of the ABCC11 gene that are common in the human population. Those of us who have at least one of two copies of the dominant version of the gene produce liquid earwax, while those of us with two copies of the recessive variant have solid earwax. Also, this gene is responsible for the production of proteins that remove sweat from the pores in the armpits, attracting odor-causing bacteria. People with hard earwax don't sweat like that, so they don't have odor problems and don't need to use deodorant. This category includes the majority of the population of East Asia, but very few Europeans.

Authors: Jimmy Wales, Larry Sanger

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This is financial analysis, accounting control, audit of the financial and economic activities of the company. The audit is carried out at the request of the company by qualified specialists, as a rule, independent services (audit services).

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Ear shape affects hearing 03.04.2018

Changing the shape of the auricle can deprive a person of the ability to determine where the sound source is. Canadian scientists came to this conclusion by temporarily changing the shape of the ears of several people.

The fact that we have two ears, not one allows us to localize sound in a horizontal plane; the brain takes into account the time gap between how the sound wave reaches the ears, and interprets it as a displacement of the source to the left or right. But this system does not help to understand whether the sound comes from below or above: the complex shape of the auricle helps us in this. Scientists from the University of Montreal figured out how the shape of the ear affects the ability to navigate by sounds.

16 volunteers took part in the experiment. Each of them sat in a chair in a specially equipped room, where speakers were placed at different heights to the left and right of the chair. Participants in the experiment had to determine where the sound was coming from. They did it well, but only until the scientists fixed silicone pads on their ears that changed the shape of the auricle. After that, the volunteers began to say that the sound came from above, while the bottom speaker actually worked, and vice versa. True, after a while, the pads stopped interfering with sound localization: the brain adapted to the new shape of the ear. The shape of the auricle of each person is individual; There are no two identical ears, just as there are no identical fingerprints, so the specific criteria by which the brain determines the height of a sound source are also strictly individual, the authors of the work conclude.

During the experiment, the scientists recorded the activity of neurons in the auditory cortex using MRI. Scanning showed that the higher the sound source, the weaker the response of neurons; it is possible that the brain determines the height of the sound source by the level of cell activity, Trapo and Schoenwiesner believe.

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