As you can see from the picture below, from left to right, the human brain is getting bigger and bigger, that is, more and more intelligent, after the intelligent, hair is also less and less, as the saying goes, “intelligent brain does not grow hair”, but for the human species, is it that the more intelligent the community of the whole body hair is less and less? Compared with monkeys and orangutans, human hair is mainly concentrated in a few specific areas, while the rest of the body is covered with less noticeable sweat hair, and the black race even sweat hair is almost completely lost, what is the reason for these differences? Humans have about 5 million hairs all over their body, and monkeys have about the same, but all of the monkeys’ hairs are the same and are evenly distributed across the skin. Why do we have less hair? Scientists have some hypotheses about this question, and some of them are very interesting. 1. Why are humans becoming less hairy? ① healthier and more hygienic British anthropologist Mark Bigelow believes that thick hair becomes a haven for parasites and an umbrella for disease, and that individuals with thinner and less body hair are more likely to get the chance to reproduce for health and hygiene reasons. This is to put it bluntly, clean, neat and tidy easier to meet the opposite sex, primitive people’s social rules and contemporary people are similar to it. ② Clothing Replaces Hair American biologist David Reed believes that when humans learned to make wearable fur (clothing), their own hair was eliminated. Obviously, when human beings are smart enough to make clothes for themselves, the role of hair has been replaced, and for the new and old human beings, there are always a variety of colors and styles of clothing to wear certainly better than draped in an unchanging hair for years. ③Easy to be burned by fire André Miller, an expert in evolutionary biology at the French National Center for Scientific Research, called fire “the main culprit”. After mastering the art of making fire, our furry ancestors began to warm themselves around campfires. When they slept, they burned their hairs, so they had to give them up. Gregory Orlov, associate professor of biology, puts it this way: our ancestors gradually shed their fur because they had to travel through the ancient African savannahs, or to adapt to life in the water, they had to become “bald” in order to reduce resistance when swimming. to minimize resistance when swimming. In summary, we can imagine a primitive man, dragging thick fur to round up prey almost heat stroke, by the hair of the lice and fleas itchy and painful, and finally found a watering hole beautifully soaked in a bath, wet hair is too heavy to climb out. Hard to climb out, in the fire barbecue, eat half of the hair dry a spark splashed up himself into a “fire monkey”, and all this bad luck is the body of the long hair brought about, he did not quickly endure the pain of these useless hair pull out? 2.What kind of hairs have been pulled out by ourselves or dropped by ourselves? Let’s start with the hair. In real life, there are always some friends suffer from hair loss, although it does not affect the health, but also can reduce the number of times to wash your hair, not to mention that in the secondary world, the less hair is the stronger, bald is a symbol of the strong! But! Doesn’t hair really matter? If it’s not important, then why doesn’t it fade along with the rest of the body hair in other locations? Hair surely can’t be lost, it’s a known consensus that hair has a huge grooming and beautifying effect on one’s appearance, and this consensus has been reached since more than 20,000 years ago, and I have the proof, check it out. This statue was completed in the 24,000s B.C. Venus of Velendorf The Venus de Brasanpui statue was completed in the 25,000s B.C. As you can see in the picture, prehistoric humans have long been able to compile intricate hairstyles and take care of their hair to gain an advantageous position in terms of sexual choices, and at least the females had hairstyles anyway. In today’s terms, both hairstyles are funky and very cool, but not cool at all when there are other places on the head, such as the face, forehead, and neck, where hair grows. We notice that both statues, especially the second one, have very smooth skin on her face and neck. It basically represents the aesthetic tendencies of humans back then. From the point of view of sexual selection, much of the remaining body hair, including hair, was used as a symbol of competition by beauty-loving humans. On the other hand, human beings lose most of their body hair by themselves. In order to fight against body hair, women have been doing whatever it takes for a long time. Ancient Chinese women had the custom of painting their eyebrows, and favored the “willow leaf eyebrow”. The Flower Room Collection, compiled during the Five Dynasties and Ten Kingdoms period, depicts even more exaggerated practices, promoting women shaving off their eyebrows and painting them with black pigment. Face-pulling is a traditional Han Chinese popular custom in which sweaty hair on a woman’s forehead and sideburns is plucked out with a thread, and her curved crescent eyebrows are trimmed. Probably the most indispensable feminine items for the modern woman are the shaver and perfume. These two things are far more important than cosmetics, and both are essential tools for dealing with sweaty hair. First in the advanced technology, many people use laser hair removal. Laser hair removal: it has the advantages of little pain, fast speed, thorough hair removal and no harm to the epidermis. Laser hair removal clinical experiment results: through 3-5 sessions, more than 95% of the cases have 80% hair loss, hairs become less, finer, lighter in color and slower in growth. If only 1-2 sessions are performed outdated, all cases prove 30% to 50% hair reduction. In most of the clinical cases, the average energy density used is only 10~20J/cm2 to be able to remove hair efficiently, thus avoiding the occurrence of medical risks such as possible burns.