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Will the left and right ears hear different sounds?
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Our two ears are symmetrically distributed on either side of the head, and they always receive sound together, except that there seems to be no difference except for the different sound sources facing.
External sound waves enter the ear canal from the pinna of the ear, "knock" the eardrum to cause its vibrations, and then through a series of structures to the hair cells of the inner ear, generating nerve impulses to the brain, and finally decoded by the auditory nerve center into the sound we hear.
It sounds like the ears are passive, and all the sounds are received. However, some studies have found that the left and right ears also have tendencies and different work priorities.
A study of 3,000 newborns showed that their left ear was more "loving" to listen to music, and that such rhythmic sounds caused stronger vibrations in the left ear, while the right ear responded more strongly to the sound of speech. The researchers speculate that this may be related to the division of labor in which the brain processes different types of information.
The scientists also found that children with hearing impairment in the right ear were more likely to develop learning disabilities than hearing loss in the left ear. In hearing tests on healthy children, the right ear was also used to understand the spoken content of the memory more than the left ear. This difference is no longer evident after the age of 13. For adults, the right ear will only show an advantage when what is heard exceeds the individual's memory capacity.
Ma Ma: Now I know which ear to say to.
What is the oily liquid on the neutral refill ink water?
There is always a colorless or yellow oily liquid on top of the ink of a neutral refill. The name of this layer of "oil" is called follower sealant, commonly known as "lithium ester" and "tail plug oil".
Listen to its name and you can guess what it's for. The viscosity of the neutral pen ink is between water and oil, its viscosity is lower than that of the oily ink, and if you shake it slightly, the ink will leak out. And long-term exposure to air, the solvent will gradually evaporate, so that the ink becomes viscous, not easy to ink. In addition, the ink will remain on the inner wall of the refill as the liquid level drops, resulting in waste.
Servo sealants are designed to solve these problems. It is formulated with base oils, thickeners and other additives. The most important base oils are generally polyorganosiloxanes. This kind of organic ingredient is insoluble in the ink, can seal and "calm" the ink, reduce evaporation at the same time, but also closely follow the ink level, let it fall smoothly, do not give them the opportunity to hang on the wall.
The follow-up sealant must also have the characteristics of antifreeze, the freezing point is less than -40 ° C, even if you run to the North and South Poles, it is guaranteed not to become an excuse for you not to write homework.
Where does the fishy smell of fish come from?
Many fish have a strong or light fishy smell, and if not handled well, it will greatly affect the appetite.
Fishy smell does not come from a single chemical, scientists have found dozens of substances with fishy or suspected fishy smell, most of which belong to the aldehyde class.
From carp alone, the researchers identified 16 possible fishy-smelling substances, including aldehydes, alkenaldehydes, ketones, and furan compounds, and determined that hexanal, heptanal, and 2,4-dielenedecaldehyde had a fishy odor.
They also analyzed the content of fishy substances in different parts and found that the fish had the most scales, followed by the gills, and the least meat. In addition, the mucus and internal organs of fish also have a fishy smell. Some of the fishy substances may originate from the water bodies in which they live.
The fishy smell of the fish is also related to its freshness. When the fish begins to rot, the protein deteriorates, and the amino acids are broken down into amines, such as putresta and cadaver amines, which emit a foul odor, and the fishy odor of pickled fish mainly comes from fatty amines such as trimethylamine.
To remove the fishy smell, in addition to paying attention to cleaning up the fish, the most common method is to add cooking wine or vinegar. Both alcohol and acetic acid react with fishy substances and volatilize them by heating, taking them away.
How is the somatosensory temperature measured?
Sometimes the real-time temperature is obviously more than ten degrees, but it is as cold as only a few degrees, or vice versa. This can not be blamed on the weather forecast is not accurate, they are just truthfully recording the air temperature, and what is really valuable for us is the body temperature.
The so-called somatosensory temperature is the temperature actually felt by the human body.
At the same temperature, the stronger the wind blows, the colder we feel. This is understandable because the faster the air flows, the faster the heat from the skin will be taken away.
Humidity also affects the somatosensory temperature, and the air humidity conference makes us feel hotter in summer and colder in winter. High humidity means more moisture, and water vapor conducts heat more efficiently than air. In the hot summer, the surface of the skin is surrounded by hotter water vapor, and sweat is difficult to evaporate and dissipate heat, making us more and more stuffy. In the cold winter, the moisture that is warmer than the skin will take away our heat faster.
In addition, walking in the big sun and walking in the shade of trees will also have a completely different somatosensory temperature.
In order to measure the effect of factors such as temperature, wind speed, humidity on human heat dissipation, meteorologists have established mathematical models and summarized the calculation formula of somatosensory temperature. Therefore, the somatosensory temperature is not measured directly, but indirectly estimated.
Still, everyone's feel is different, which is why you're already wrapped in a ball in the same temperature, but he's still wearing short sleeves.
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Source: Xinhua Magazine of All Things