Obviously, this scientific knowledge was correct, but even Einstein could not accept it.

Objectively speaking, it's hard for people in this world to accept everything we need to learn. Or we can say that study of this question is in itself an anti-human affair. Multiplication tables and old rhymes memorized from kindergarten or elementary school are actually extremely painful for children of this age. In middle and high school, knowledge to be mastered is even more inhumane, especially in subjects like math and physics.

In fact, process of cognition of world by a person is also same. In ancient Greek era, Aristotle once explained relevant theories of motion. This theory fits our intuition very well. For example, if two objects are thrown from same height at same time, then one that hits ground first will be heavier.

But now we also know that this concept is actually wrong. The anti-humanity here lies in how to think about this problem. The method used by Galileo is to eliminate interference due to resistance. So he proved that two objects must fall to ground at same time using inclined plane experiment.

Another point: our famous Leaning Tower of Pisa experiment is actually recorded only in a book written by a student of Galileo, and we still have no way of proving that it actually happened.

The free fall experiment didn't end because of Galileo's experiment. Later, many people repeated this experiment to constantly test Galileo's point of view. Knowing about free fall is very counterintuitive.

If you have received some kind of education, you can also get this knowledge. In addition to Galileo, it also includes Newton's theory of mechanics. Some even think that all this is not so difficult to accept.

The reason I think so is because this theory applies to low speed state of macro. The world we live in belongs to world with a macroscopically slow speed.

However, in addition to Newtonian mechanics, many people do not understand quantum mechanics and theory of relativity. The fundamental reason these people cannot understand is that these two theories do not describe world at a macroscopically slow speed. The theory of microscopic world is described by quantum mechanics, while theory of relativity describes situation of large scale, fast speed (close to speed of light) and high gravity.

These two scales are too far away from us, and we simply cannot perceive laws of physics in these two scales, so it is normal not to understand these two theories.

Quantum mechanics has a well-known cornerstone theory: uncertainty principle. This theory tells us that we cannot simultaneously know information about position and momentum of a particle. When we accurately measure momentum information of a particle, we cannot accurately measure particle's position information; when we accurately measure particle's position information, we cannot accurately measure momentum information.

It's incredible to apply this theory to macroscopic and low speed world. But now microscopic world is like this: take, for example, an electron outside nucleus, we cannot know where it is, we only know probability that it is in a certain position. Thus, electrons represent situation of a probabilistic cloud.

The microscopic world is full of uncertainties, which is most disruptive discovery in field of science in 20th century. Even Einstein stood on opposite side. Einstein spent his entire life proving incompleteness of quantum mechanics. He even said: God does not play dice. refute uncertainty principle.

But, unfortunately, Einstein was really wrong. Today's experiments have proven that uncertainty principle is very accurate in describing microscopic world.

However, if you think that there is only uncertainty in microscopic world, you are wrong. The twentieth century in history of science is also called century of uncertainty. Over these 100 years, scientists have not only discovered that microworld is indefinite. In fact, scientists have also found that macroscopic world also has these properties.

I think many of you have heard of Butterfly Effect. It is said that when a butterfly flaps its wings in South America, a month later a hurricane rages in North America.

The butterfly effect is used as a metaphor by scientists, and theory behind it is actually called Chaos Theory. The theory here makes us understand that macroscopic world is also full of uncertainties, but even if initial value of chaotic system changes slightly, result will be very different.

It's actually not just a chaotic system. Scientists have found that many seemingly linear and simple systems eventually become complex, non-linear and beyond description.

As big as international politics, stock market, and as small as human life, they are actually full of uncertainties that cannot be described by a single cause and effect. Take, for example, a pile of sand. When you keep throwing sand in, you can never tell which grain of sand is in it, and pile of sand will collapse.

Whether it's Uncertainty Principle or Chaos Theory, they've both been proven right. But at same time, they tell us that world is unstable. It is difficult for human nature to accept uncertainty.