When talking about lice , you may feel your scalp numb. It is such a small thing that has brought a lot of trouble to humans.
The body structure of different lice
It has appeared in a long history than that of humans and has coexisted with humans for thousands of years. Why can't we see it in recent years?
0 million years ago lice
In 2011, the British " Daily Mail " published a paper saying that scientists extracted genes from 69 lice and found that lice had existed as early as the era of dinosaur rule before 65 million years ago .
These lice parasitize in the dinosaur's hair, making the dinosaur's temper become quite irritable.
Dinosaur: Being born with a bad temper is not easy to mess with
Dinosaurs can only use fighting to reduce itching on their bodies.
After the planet hit the earth, the lice survived and parasitized among some densely-haired animals and began to evolve.
lice breeding process
During this period, bird hair is the best place for lice to live.
, birds are not terrestrial organisms after all, and their living habits make it difficult for lice to adapt to .
About 30 million years ago, primates appeared, so lice naturally came to primates.
Later, chimpanzees were differentiated from primates, which were close relatives and ancestors of humans, and lice also entangled chimpanzees.
About 4 to 6 million years ago, human differentiated and became an independent species.
primate differentiation
There are also differences in the lifestyles of humans and chimpanzees, and the lice on the two are also evolving in different directions.
As species subdivided, different races appeared among the differentiated humans.
For example, early talented people, Homo erectus , Homo sapiens , etc., live in different environments, and have different body shape characteristics and lifestyles.
The lice on them are also constantly evolving in .
Homo Homo sapiens lived about 200,000 to 40,000 years ago, and then "modern people" were created.
Human evolution process
After human evolution as a "modern human", as a high-level primate, there are no other branches. Theoretically, there should be only one species of lice on humans nowadays.
But this is not the case. American scientists have discovered that there are mainly two types of lice in humans. These two types of lice only began to differentiate about 1.2 million years ago.
In other words, there is only one lice that is a breed of “modern people”, while the other lice is foreign!
What does this mean?
Scientists believe that the two lice in humans prove that about 40,000 years ago, the ancestors of "modern people" had close contact with Homo sapiens .
Because lice can only be spread through fighting, wearing the same piece of clothing, intimate behavior, etc.
Of course, to prove the authenticity of this statement, more evidence is needed.
If this statement is true, in the history of human evolution, it will be a subversive existence of .
Many scientists also believe that American scientists must have an accurate data on the number of two types of lice on humans. Using the sample to estimate cannot be completely convinced.
The amplified lice
In fact, no matter which statement it is, it cannot change the fact that lice gradually disappears into us.
Especially after entering the 21st century, traces of lice are rarely found in human hair. A "human entanglement" that has accompanied humans for millions of years seems to have disappeared in just a few decades, which is confusing and worrying that he has held back his big move.
Environmental Sanitation
When it comes to the reasons why lice disappear, we have to talk about the favorite place of lice: hair.
But not all hairs are suitable for lice survival.
lice lay eggs on hair
For lice, one is to be jealous of water, and the other is to be unable to smell the fragrance. The fragrance is tantamount to "toxic gas" for lice.
Only dirty and smelly hair is the ideal place for lice to settle down.
Especially those who don’t wash their hair for ten days and half a month, lice like it even more.
In the early and mid-term last century, most people in our country were busy with their lives and had no time to take care of their personal hygiene.
Therefore, everyone's hair became an excellent place for lice to live in. These lice lurked in people's scalp and reproduced their offspring at will. Therefore, people at that time took off their scalp and grabbed a lot of lice.
Human scalp structure
As for shampoo, soap and other tools to clean the body , only rich people will use it.
Most poor people rinse them with clean water.
. Lice will increase adhesion in human hair. The longer the time, the harder it will be to be washed away.
If you rinse frequently, you can wash away the lice on the scalp. Even without shampoo, lice will be difficult to parasitic.
But everyone does not need cleaning tools to take a bath, nor does they take a bath frequently, so it is reasonable to have lice.
After the founding of the People's Republic of China, the country has developed steadily. Everyone is busy in the fields and has free time at night. So they start to pay attention to their hygiene situation. As people's living standards gradually improve, they also start to use cleaning tools when taking a bath, such as rubbing their skin with bath towels .
Skin structure is shown in the figure
After the reform and opening up, people's living standards have improved rapidly, and they have paid more attention to personal appearance and appearance. Various cleaning supplies from abroad have also flowed into the domestic market and are highly sought after by everyone.
Nowadays, people want to take a hot bath The cost is very low , basically one hot bath a day.
How do you parasitize lice? I'm afraid I'll be washed away by hot water before I stood firm.
It’s fine if you are diligent in taking a bath, but the key is that you have a wide range of cleaning tools. The fragrance is everywhere in a hot bath. Some girls will spray some perfume on their bodies. A parasitic environment like
makes lice say it can’t do it and leave the human body cursingly.
minor reasons
People love cleaner more is a main reason, and the second reason is that people give lice less chances of spreading .
Lice spread to the human body and grow rapidly
In that poor era, a piece of clothing can be said to be "Three generations of ancestors" .
You can just spread it, it’s important that you won’t wash it for two or three months.
is like this, and it is repaired and the seams are filled with clothes.
is wearing it back and forth, and even if there are no lice on your body, it will be infected by others.
After living conditions are improved, everyone wears their own clothes and throws them into the washing machine for a day, takes them out and puts them in the dryer and adds ultraviolet rays to disinfect.
How can lice parasitized in clothes bear such "torture"? They ran away one after another.
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Of course, for some people with special physiques, even if they take a bath every day, they still have lice on their bodies.
Don’t worry, science is so advanced today. Just go to the hospital and ask the doctor to prescribe some chemical agents and spray them twice a day. The parasitic lice will soon die on the spot.
If you don’t want to go to the hospital, just shaved ’s hair , cover your scalp with a wet and hot towel every day, and apply alcohol after you finish it.
Lice CG
If everyone is worried about lice or parasites in the sheet, they just need to soak the sheet in boiling water for a period of time, and all the lice and eggs will be killed.
For clothes that are not resistant to water and heat, you can dry clean the lice parasitized on it, and then spray them with pure natural insecticide that is harmless to the human body.
It is worth noting that lice do not completely disappear in our lives. If you do not like to clean , it will not take long for the "ghostly" lice to come back.
Lice-transmitting disease
Today, there are still some remote mountainous areas in our country where people are backward living conditions, and some people are still suffering from lice.
Fortunately, our country is vigorously supporting remote mountainous areas every year, and I believe that our country is about to achieve "lily free from all people".
