Today’s curious shrimp cold knowledge sharing,
is here as scheduled!
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·How long can a person's hair grow?
Generally speaking, human hair grows from 0.3 to 0.4 mm per day. If you don’t cut your hair, can you keep growing?
is not actually like this. Human hair has a hair cycle, and each hair is in a cycle of three phases: the growth stage, the regression stage, the regression stage, and the rest period.
Generally speaking, the growth period of hair can last 4 to 7 years, the regression period is 2 to 3 weeks, and the rest period is about several months. According to this speed and growth period, it can grow to about 50 to 100 cm, which means that most people's hair will enter a regression period when it is less than 100 cm long, and then fall off and enter a rest period.
What we often call "long hair and waist" may also have something to do with it.
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· Can pet nose patterns prevent loss?
The nose pattern of pets is similar to human fingerprints and will not change as they grow, and is unique and immutable. This means that there will be no two dogs with exactly the same nose pattern in the world.
Therefore, after entering the nose pattern to create an electronic file, no matter where the pet goes, the relevant staff can clear its identity by scanning their noses. It can truly realize the digitalization of pet management and make it more convenient to search for lost pets. At present, the accuracy rate of pet nose pattern recognition technology has exceeded 99%.
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· Why are dry clothes so smelly?
More than two-thirds of the dirt on clothes comes from secretions outside our bodies, namely sweat and sebum. If the sebum is not washed clean during the laundry process, it can become the culprit for the source of the odor of the clothes (not properly dried).
Because these natural oils will sink into the fibers of the fabric without washing them off, and they are very viscous and easily attract dirt. This provides an excellent "peptide dish" for the reproduction of bacteria and fungi.
If the weather is cold and wet, and the clothes cannot be dried, bacteria will react with the residual sweat, skin cells and other gland secretions on the clothes, producing volatile organic compound , which will produce odor.
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· What color is the initial color of the tire?
The world's first tire is white because natural rubber is white and there is no additive inside. By the 19th century, different ingredients were added to the production of tires, so the colors were varied.
Later, after experiments, it was found that the service life of the tires added with carbon black raw materials was 4 to 5 times longer than the original natural rubber white tires, which can also improve driving safety. In the following hundred years, black tires became the standard configuration.
In addition, black tires match whatever color of the car model, so that automakers can only consider the color of the body, without having to worry about what color of tires to match, saving a lot of money.
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· Why are kangaroos left-handed?
A research paper on "Contemporary Biology " in 2015 found that eastern gray kangaroos and red kangaroos are almost all "left-handed".
In the past, leniency was considered a phenomenon that only humans and some primates had. It was discovered in kangaroos and broke our original cognition. Why are kangaroos "left-handed"?
Researchers have given a guess, which may be related to the lifestyle of their ancestors. The ancestors of the eastern gray kangaroo and red kangaroo both lived in trees, so one thing that needs to be guaranteed in daily life is to prevent themselves from falling off the tree. For this reason, they firmly grasp the trunk with their right hand, while their left hand was freed up to do all kinds of chores, such as eating, tidying their hair, etc.
Over time, the left hand becomes more and more flexible, and it remains the same after going downstairs.
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