Science in the Week: Will Tying Your Hair Often Make Your Hairline Higher?

2022, Week 7, Issue 5, Total Issue 21

It’s almost the time of season change. What do you usually want to do at this time? I’ll start with: “I want to see the first flower of spring.” Here are the most popular scientific topics that we selected from Weibo, WeChat, Zhihu, Baidu, Toutiao and other information websites this week:

#Will tying your hair often make your hairline higher#

#A woman's down jacket broke the dehydrator in 5 seconds after it was dried#

#Why are ski races afraid of snow#

#Why are there so many kinds of ice skates#

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1. Will tying your hair often make your hairline higher?

As of February 17, the Weibo topic has been read 110 million times ★★★★★

As the years go by, most people will have thinning hair and a gradually upward hairline, and the reason behind this is hair loss. Generally speaking, about one-half of men and one-quarter of women will be affected by hair loss. Among them, male hair loss is mainly androgenic alopecia, referred to as "male baldness". Its mechanism is actually caused by genes and androgen levels. When men enter puberty, a large amount of testosterone (also known as androgen) will be secreted in the body, and testosterone will form a stronger and more effective androgen under the action of specific enzymes - dioxytestosterone. This hormone will make men's beards and chest hair thicker, but the cost is that the hair follicles on the top of the head and the occipital area will become smaller and smaller, which will cause the hair to grow thinner and softer. This process often takes a long time, so men usually enter the peak of hair loss around the age of 40 to 50; women's hair loss is more caused by external force pulling, that is, traction alopecia, which is generally caused by certain special hairstyles that cause hair to break or fall off, such as high ponytails, middle parts, braids, etc. Tying your hair too tightly will make the hair and scalp tight, and the hair roots will be in a state of tension for a long time, which will damage the hair roots. It will also slow down the blood circulation in the head and affect hair growth. Over time, the hairline will naturally move back.

Hotspot sources:

https://s.weibo.com/

Image source:

Tuchong Creative

The editor has something to say: You may look handsome with a high ponytail, but when you lift your hair up and let it fall, it's really embarrassing.

2. Woman blew up the dehydrator after drying her down jacket in 5 seconds

As of February 17, the Weibo topic has been read 130 million times ★★★★★

On February 14, a lady in Ji'an, Jiangxi, washed her down jacket by hand and then put it into a washing machine for dehydration. After a few seconds, the jacket exploded and the machine was damaged. In fact, this is not the first time that a down jacket has been "exploded" and has become a hot topic. In recent years, there have been many stories of "down jackets and washing machines" hurting each other. For ordinary household washing machines, the dehydration process is generally completed by the drum, and the down jacket is filled with down-like objects such as duck down and goose down, which can store a large amount of water. During the drying process, water is constantly lost and air is constantly pouring in. At this time, the volume of the down jacket will expand to a certain extent, but the "fatal" thing is that the down jacket expands not as a whole, but partially, which causes the weight of different positions of the down jacket to change, which can easily cause the weight in the drum to be unbalanced. When rotating, the drum will constantly collide with the outer wall of the washing machine (those who have used a washing machine to spin clothes should be familiar with it. When spinning, the drum makes a loud noise), resulting in the outer wall of the washing machine being damaged by the internal drum.

Hotspot sources:

https://s.weibo.com/

Image source:

https://www.chinada.cn/channels/serve.html

The editor has something to say: Down jackets have once again become a "hot item".

3. Why are ski racers afraid of snow?

As of February 17, the Weibo topic has been read 22 million times ★★★☆☆

Recently, snow has generally fallen in the three competition areas of the Beijing Winter Olympics. The Beijing Winter Olympics freestyle skiing women's slopestyle qualification competition, in which Gu Ailing participated, was postponed. Why was a skiing competition affected after it snowed? In fact, although the snow events seem to be held on the snow, the problem is that if it is snowing, it will affect the visibility of the athletes, leading to safety problems. In addition, natural snowfall will affect the density of the snow used for the competition, because the natural snow is relatively humid and it is very fluffy when stepped on. For events like freestyle skiing, there are certain requirements for the speed of athletes on the field. The newly added snow will make the surface of the track soft, increase friction, and be unfavorable for the athletes to complete the established actions. Therefore, when encountering snowy weather, according to the International Ski Federation's "Snowboard and Freestyle Skiing International Competition Rules", if the safety or fairness of the venue is not suitable for continuing the competition, the referee committee has the right to cancel, interrupt the competition or decide whether to postpone the competition.

Hotspot sources:

https://s.weibo.com/

Image source:

Tuchong Creative

The editor has something to say: Water sports competitions are also afraid of rain because it will cause water to splash.

4. Why are there so many different types of ice skates?

As of February 17, the Weibo topic has been read 15 million times ★★★☆☆

The Winter Olympics has come to an end. I believe everyone has more or less understanding of the Olympic events. Generally speaking, they are divided into ice events and snow events. In the ice events, the four major events of short track speed skating, speed skating, figure skating and ice hockey, athletes all wear ice skates and ice skates and move at high speed on the ice. Although they are all called ice skates, the design and specifications of ice skates are very different for different competitions. Among them, the ice skates for short track speed skating and speed skating are the sharpest, with smooth blades and thinner thickness (only 1.3 cm). This design is to pursue the ultimate speed under the premise of safety. However, there are also differences between them. The ice skates for speed skating are a kind of "detachable blade" called "Klep skates", that is, the back of the ice skates can be separated from the shoes, and only the front blade serves as a fulcrum. This design is to allow athletes to kick their legs more powerfully, while increasing the contact time between the ice skates and the ice surface each time they kick the ice. It is suitable for speed skating with longer tracks. The characteristic of short track speed skating skates is that the bottom of the blade has a slight curvature, and can be moved left and right to adjust the position, so that short track speed skaters can sensitively control the ice skates and the direction of skating. The reason why figure skating can spin like a "spinning top" on the ice lies in the ice skates. The ice skates they use have a serrated blade at the front end, which can help athletes complete actions such as jumping and running on tiptoe. Compared with the previous "speed group" ice skates, the blades of figure skating skates are also shorter and thicker (about 3.6cm). As for ice hockey, since the ice team has more confrontational actions, the players need to frequently sprint, turn sharply, and stop suddenly. Therefore, the ends of the blades of ice hockey skates are more rounded and the blade is lower, which helps to lower the center of gravity and has both safety and flexibility.

Hotspot sources:

https://weibo.com/

Image source:

Xinhua News Agency

The editor has something to say: Others use ice skates and enjoy the smoothness, but I use ice skates and feel: Hey, why can’t I stand up?

In conclusion:

① If you want to avoid hair loss caused by pulling your hair, try not to tie your hair. If you have to comb your hair for some reason or you really like combing your hair, try to comb your hair loosely to keep your scalp relaxed.

② In fact, there are washing instructions on the labels of all regular clothing. Not all down jackets can be machine washed. Similarly, many washing machines cannot fully "handle" down jackets. Therefore, this is actually a process of "running in both directions". If one of them is not suitable, it is recommended that you do not put the two together;

③ If there is floating snow on the ice and snow track, the staff needs to clean up the floating snow to ensure the normal progress of the event and reduce the chance of athletes getting injured;

④ Ice sports that combine elegance, speed, and skill can be said to be sports that require athletes to be armed to the “tip of the knife”. It is precisely because different ice skates have different functions that we are able to appreciate the wonderful performances of athletes at the Winter Olympics.

Source: Interesting Science

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