The strange thing is that both stars and planets, and then some moons, are spherical. Many people have asked me: Why are all these planets spherical?
Because iron is exposed to air, about 21% of the air is oxygen, and oxygen reacts chemically with iron to produce red iron oxide, or what we commonly call rust.
But what we have achieved is amazing, people's quality of life has been greatly improved, and at the same time, eyes have been turned to the sky and the universe has been explored in all directions.
Amazon River is known as "human forbidden zone", it is said that no one dares to swim in the Amazon River, is this true? It is said on the Internet that the Amazon River once blew up a 1-ton python, what about this?
When hearing about advanced cancer and metastatic tumors, many people feel that there is no hope for survival, but in fact there are more and more patients with advanced cancer who are able to obtain long survival.
Ancient people say: "The epidemic is only three", literally meaning that no matter how big the epidemic is, it will be over in three years at most. And now, the new crown continues to be the third year, heard the news is still so grim.
It may be a bit arbitrary to say so, but it is no longer possible to solve the problem without saying so, and if we continue to choose to ignore it, we are letting this way of perception of modern science continue to slide into subjectivism and the "supernatural" path.
I believe no one would object to saying that he is one of the greatest scientists of the twentieth century. Any other theories of physics pale in comparison to these two major theories.
Early in development, human embryos form a structure called a blastocyst. Two Chinese research teams have successfully generated human blastocyst-like structures from cells in culture dishes, providing a valuable model for advancing human embryology. Understanding early human embryonic development is critical to improving assisted reproduction techniques, preventing pregnancy failure, and preventing birth defects. However, research to study early development is limited by many factors.