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Although infinity is a rather illusory and abstract concept, and it is quite taboo in physics to use any definition of "infinite", it is still a very interesting question. Let's not talk about "infinitely long" ladders for now. Perhaps it is more acceptable to use "long enough".
Can we use an infinitely long ladder to leave the earth without reaching the first cosmic speed?
05/22
1711
Only three scientists worldwide have received this honor. Yuan Daoxian, a professor at the School of Geographical Sciences of Southwest University, is among them. He is a famous geologist, hydrogeologist and karstologist.
There are only three in the world, and the Chinese are among them
05/21
1484
To put it simply: the speed of light is 300,000 kilometers per second, which is indeed very fast, but light does not require any power to reach the speed of light, and there is no acceleration process. To put it bluntly, light is "born" at the speed of light, and it must be the s
The speed of light reaches 300,000 kilometers per second. It is so fast, what is the power?
05/21
1927
Generally speaking, in the weightless environment of space, water should float in the air and assume a spherical shape, as shown in the picture below. However, during the Shenzhou 13 space lecture, a photo of a water cup caused some confusion. From the picture, it can be seen tha
Why doesn’t the water on the space station float out of the cup?
05/21
1507
If you neglect them, they will rot. Dr. Estelle Lazar, a forensic archaeologist from the University of Sydney, spoke to ABC News about your pearly whites after death.
What happens to your teeth when you die
05/21
1755
There is a plot in science fiction movies where a person is frozen in ice due to an accident. When he thaws out and wakes up again hundreds of years later, he faces a completely different world than before.
The world's first frozen man took 2 years to thaw. Has he been successfully awakened?
05/21
1964
"Genius is on the left, madman is on the right." "The ultimate genius is madness, and the ultimate madness is genius." Regarding this point of view, some people agree and some do not.
26 years ago, the high school student who built a "nuclear reactor" at home later died of alcoholism and poisoning
05/21
1374
At present, investment institutions prefer the layout of technology platforms. Nucleic acid drugs have overcome the "difficult-to-drugability" and "undruggability" problems of traditional drugs, and have various advantages such as short research and development cycles, high resea
Be wary of wasted investments and prefer investing in technology platforms! Nucleic acid drug research and development is not hot enough
05/21
1581
Introduction to the results Inspired by agricultural ridge technology, in this article, researchers such as Associate Professor Guo Xingmei and Professor Zhang Junhao from Jiangsu University of Science and Technology, Professor Sheng Lin from Shandong University published a repor
Jiangsu University of Science and Technology: Cobalt nickel selenium nanosheets grown on 3D carbon framework for use in supercapacitors
05/21
1591
Italian physicist Volta invented the battery. Italian physicist Volta. Although electric lights, telephones, refrigerators, televisions, and computers have entered people's homes, electric motors are also widely used in factories. These strong currents are drawn from generators.
"The Story of Invention" (74) - Italian physicist Volta invented the battery
05/21
1748
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Modern science believes that our universe was born 13.8 billion years ago. 13.8 billion years ago, a singularity exploded. The singularity is an infinite mass, infinite energy, infinite heat, infinite mass, and infinite density. Large, infinitely small point. After the explosion
There is a gravitational source outside the orbit of Pluto. Scientists: It may be the legendary ninth planet
05/23
1449
When it comes to snails, the first thing that comes to mind is that they have a thick shell. In fact, in addition to being known for their thick shells, snails are also the animals with the most teeth in the world.
Snails are said to be the creatures with the most teeth in the world. So what are the uses of so many teeth?
05/23
1641
Walking people have to adjust their gait again and again to walk on curbs or steps. Whether intentionally or not, everyone has developed control strategies to control muscle activity in response to changes in the outside world, thereby protecting them from tripping. effects of ti
Two main strategies for robot gait control
05/23
1358
The majority of overseas Chinese are very concerned about Hong Kong's continued stability, prosperity and development. Recently, Sun Dawen, a well-known Chinese scientist and academician of the European Academy of Humanities and Natural Sciences, wrote an article to express his w
[Tongxinyu] The pearl is dazzling and the bauhinia is beautiful - Chinese scientist Sun Dawen writes an article to celebrate the 25th anniversary of Hong Kong's return to the motherland.
05/23
1190
Got a story for July 4th? Today is also called aphelion. This day is the day when the earth is farthest from the sun. The time it takes for the earth to orbit the sun is one year. The place where the earth is closest to the sun is called perihelion. It is in early July every year
July 4th, the story you don’t know
05/23
1745
According to Global Network, in an environment of increasingly tense international situation, NASA Administrator Nelson recently made a series of remarks against China. In an interview with German media, he hyped up the "Chinese space threat theory" and bluntly stated that China
NASA exaggerates China's "military space program", and China makes it clear: the United States is seeking space hegemony
05/23
1424
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Recently, South Korean girl group Fromis_9 has been a hot topic. First, member Lee Seo-yeon was infected with COVID-19, then member Lee Sae-ron caused huge controversy due to her live broadcast performance, and then member Baek Ji-heon needed to temporarily stop activities and re
South Korean girl group Fromis_9 Lee Sae-ron and Jang Kyu-ri were diagnosed with COVID-19 and had caused controversy due to inappropriate remarks
05/23
1377
On the 12th, criticism of Lee Sae-ron, a member of the girl group fromis_9, appeared on a Korean online forum because of her mistaken speech during the Vlive live broadcast the day before. What happened was that on the 11th, five members of fromis_9 conducted a Vlive live broadca
She started to complain regardless of the cause and effect... Did she really make such a big mistake by saying this?
05/23
1818
IVE members get individual endorsements? Breaking the preferential treatment controversy? In the past few months since IVE's debut, although they have achieved great results, there have also been many controversies. The preferential treatment of Wonyoung and Yoojin by their agenc
IVE members break the controversy over preferential treatment? Got a solo endorsement; a member of a girl group made a mistake during a live broadcast?
05/23
1871
Her husband is a professional LoL player? A member of the girl group who has only debuted for 6 months publicly stated that she is the mother of a child and is about to divorce her husband, which is surprising.
A girl group member was revealed to have a child after her debut? Her husband is a professional LOL player; TXT Soobin's relationship was exposed?
05/23
1654
Friends who follow K-pop, you must have a goddess in your heart! Whenever they come back, they always make you feel the beauty craze. Today we will take a look at these ten beautiful idols. They have such fairy images that people can’t put down. Let’s see who they are, right?
10 female idols with fairy temperament that people can’t put down. They are full of fairy spirit
05/23
1418
In order for female idols to have beauty and figure, in addition to controlling their diet, they also need to exercise consistently. Today I would like to introduce seven representative girl group members who have just turned 20 years old (Korean age) and were born in 2000 with b
So they are so small? A female idol born in 2000! kpop future hope
05/23
1689