The worst frog in history: Every time it jumps, it ended with his head.

Welcome to technology for a week. This week you will see: ① The mini frogs who flipped through the jump; ② human brain is hotter than expected; ③ polar bears living in glaciers; ④ secrets to quit smoking instantly; ⑤ cold -resistant battery.

Landing failure

Some frogs do not know how to land! This sentence is a bit inexplicable, but you understand when you see the video below -these mini frogs cannot control their bodies after jumping, they always rotate in the air, and then fall directly to the ground.

Short -headed toad jumping through the car. Too miserable, I shouldn't laugh ... | Richard L. Essnerjr et al.

These little guys are short -headeds (Brachycephalus) living in tropical rain forests in Brazil, because the bright yellow appearance is also called "pumpkin small toad". The short -headed toad is very small, only as large as the nails, and their clumsy landing is actually a smaller price.

BrachycePhalus Didactylus is less than 1 cm in length and is one of the smallest frogs in the world | Diogo Luiz / Wikimedia Commons

Originally, animals should perceive the balance of the vestibular system of the inner ear. The semi -regulatory tube here is full of internal lymph liquid, and liquid fluctuations can stimulate the balanced feeling. However, the CT scan shows that the inner ear structure of these small frogs is too small, which makes the internal lymph liquid unable to flow freely and weaken the sense of space and balance of the short -headed toad [1]. Therefore, it is difficult for them to perceive the small space position during the landing process. Fortunately, short -headed toads only crawl slowly, and rarely choose to jump, they may not be injured because of this.

Brain hot

Brain -fever is the conventional state of human beings -a study found that the brain temperature of healthy people is actually much higher than expected [2].

Conditional changes in the brain temperature over time | n rzechorzek/mrc lmb/brain

Using magnetic resonance spectrum, the researchers meticulously measure the brain temperature of 40 healthy subjects. The results showed that the average temperature of people's brain reached 38.5 ° C, which was 2 ° C higher than the body temperature measured by the mouth. The hill brain in the depths is hotter than the surface of the brain, and the temperature reaches 40 ° C or above. The high temperature of the brain should be related to its highly active metabolism.

Studies also show that the temperature of the brain will be affected by age and gender, and it will also cause periodic changes in different periods of day. People's brains always become the hottest in the afternoon and the coolest at night. Understanding the changes in brain temperature can help people better assess the health of patients with brain injury and provide them with more reasonable treatment. Glacier North Bear

In the southeast Greenland, scientists discovered a group of polar bears that have not been known in the past. This week, they published this discovery in "Science" [3].

Polar Bear living in the southeast of Greenland relies on glaciers to maintain survival | Thomas w Johansen

Gene analysis shows that this newly discovered polar bear group has considerable genetic differences with other types of previous known groups. Polar Bear usually relies on sea ice to hunt, while this newly discovered polar bear can survive in a limited environment of Haibing. They live at the end of the glacier and use glaciers to push the ice mixture in the sea to replace the sea ice as a temporary predation platform.

This discovery brings new hope to the protection of polar bears: at the moment when climate change leads to a reduction in sea ice, glacier ice may provide them with survival support for longer. However, researchers also pointed out that glacier habitats are not enough to accommodate a large number of polar bears.

Smoking is missing

Sometimes, brain injury can bring unexpected results: In a few cases, it may make people lose addiction instantly and easily quit smoking.

After the brain injury, some patients suddenly lost their addiction. The red area in the picture showed their damaged brain area | JOUTSA, FOX et al.

Recently, some researchers analyzed this magical phenomenon. The researchers found 34 cases of sudden losing smoke addiction after the stroke, carefully reviewed their brain scanning results, and compared with other cases. At first glance, these patients with mysterious disappearance of smoke seemingly disappeared at first glance, and their damaged brain areas are also different, involving the back side buckle back, outer forehead leaves, and island leaves. However, through the data of neural connection group, the researchers discovered the connection behind these damaged areas -they actually belong to a complete neural network related to addiction [4].

Finding where the "addiction neural network" is located, which can help people develop more effective addiction treatment methods. Of course, it is not necessary to destroy these nerves to remove addiction. Use electrical stimulation or magnetic fields to intervene in them is a safer method.

Cold -resistant battery

Chinese researchers have developed a new type of lithium -ion battery that is good at dealing with the cold environment. [5] At −20 ° C, this battery can still maintain a capacity of 85.9%at room temperature. Even if the temperature drops to -35 ° C, it can still be charged smoothly.

Most of the lithium -ion batteries on the market currently perform poorly at low temperature | Hellbergstina/Pixabay

Here, the key to improving battery performance lies in anode materials. Researchers synthesize a 12 -sided carbon nano -ball material with small raised surfaces, and used it to replace graphite to make the anode of lithium -ion batteries. The structural change of the electrode material reduces the energy barrier of the combination of lithium ions and electrodes.

At present, the researchers have only used a small button battery to conduct preliminary testing of new materials. If the production scale can be expanded, these new batteries will be applied in extreme weather environments.

references

[1] https://www.science.org/doi/10.1126/sciadv.abn1104

[2] https://academic.oup.com/brain/advance-rctocle/doi/10.1093/awab466/6604351

[3] https://www.science.org/doi/10.1126/science.abk2793

[4] https://www.nature.com/articleS/s41591-022-01834- y

[5] https://pubs.acs.org/doi/full/10.1021/acscentsci.2c00411

Author: Mai Mai, the window knocks on the rain

Edit: Window knocking rain

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