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A fool learns from his mistakes, a clever one learns from others. All, most likely, heard this proverb, in one form or another. But let me say that it is applicable, most of all in the learning process. If you are still studying, then yes it is possible. But this statement, does not help us at all in the process of development or improvement.
       Consider the example of the theory of evolution. Although I think that evolution does not exist in the context as we are presented by its scientists, but in textbooks they write, that means we will also adhere to its provisions. Evolution is a process of improvement and development. Let's fantasize. Take the snake. Another snake that does not have protection rights, and let's say it suffered from rodents. As the theory of evolution teaches us, in the process of cultivation, for the species's self-preservation, the snake has a "poisonous mechanism". This mechanism consists of a gland that produces a poison, a duct of the poisonous gland and teeth with channeling channels. the figure shows that the mechanism itself is very compact. Snake venom does no harm. As far as we know, snakes do not suffer from their venom or the venom of other snakes inside their species. But a lethal outcome is ensured if, for example, a snake bites a more poisonous snake of a different kind.
      To understand the very process of the appearance of such a mechanism, let us consider the process of reproduction of any living organism. It is unlikely that this would happen with one offspring. The parents did not have, but the offspring appeared. Most likely this process continued for many generations. The poison is dangerous and, probably, not at once at the snake the mechanism of protection against the poison was developed. She was like a "fool" constantly poisoned by it. Otherwise, how could immunity develop to its venom, as biologists say. Do not try not to know. Do not you think that she has seen it from someone else, for example, a scorpion? This process of mechanism development must be long, painful and deadly. I would say to the suffered. And at one point an antidote appeared, and the body acquired protection. The very organs of the "poisonous mechanism" also underwent an evolutionary process. Not immediately appeared a way to protect the body from penetrating the poison, through nearby tissues. More than one generation of snakes died out until they found a way to protect themselves from their poison.
      So you can consider it indefinitely. Take any event in the world and say whatever it would be. It is impossible to teach such things by the example of others. Through this it is necessary to pass. Not without reason there is an opinion that all inventions are the result of someone's mistake. Perhaps something in our world can not be foreseen or guessed, but it is possible to learn through trial and error, and if it is required to obtain the result of the result.
      In conclusion, if you study, making mistakes, will give you a more expanded view of the subject of study. You need to know the right and wrong side. But to achieve perfection in something, one must go a long way and mistakes are inevitable.   ** If you want to be the best, do not be afraid to make mistakes, but be prepared for unforeseen and dangerous consequences.**