On the question of "technology".

Perhaps, in the eyes of many people, they can immediately engage in blast furnace ironmaking, penicillin refining, airplanes, and tanks in ancient times. But this is practically impossible.

If we go back to Einstein's time and publish papers before Einstein, that's okay, because the theory needs enough evidence. But as the so-called one step ahead is crazy, half a step ahead is fashionable, and the vulgar saying is called "taking too big a step is easy to pull eggs." ”

There are certain conditions for any theory or technological progress, to take the simplest example, after crossing the train, everyone will think of the convenience and practical significance of the train, which is not wrong, but it is impossible to build a train in twenty years. The invention of the steam engine required the large-scale mining of coal, which involved the mining industry; If you need to seal it, you need rubber, and rubber is produced in the tropics, and you need advanced navigation and shipbuilding, and so on.

Some people may say that a farmer can build an airplane now, but now there is an artifact called Taobao, and you can even go to the scrapyard to pick it up......

These achievements are inseparable from personal hobbies, ideals, and struggles. But as the so-called good woman is difficult to cook without rice, if it is out of this era, it is unthinkable.

Therefore, in the name of science and technology, this book tells more about the secrets, details and meanings of some science and technology, and tries to establish and improve the entire science and technology system.

Many people will say that ancient China's so-and-so technology is ahead of the world for many years, but the level of science and technology is not like this. Technology is a whole system, involving many aspects. Technology is only specialized in one area, and the understanding of intellectual property rights in ancient China was not well understood (and still is). So I left a lot of regrets.

In the end, this book is a novel, and it needs the support of a storyline, and if there is no plot, it is a technical treasure book, which will be even more boring.

Finally, since it is impossible to generalize all my knowledge, there will inevitably be some mistakes in the book, and if you feel that there are any obvious mistakes, please point them out.

In addition, ("The author is too verbose.,Everyone said to drag it out......) There are recommendations next week.,But because of the delay of some things.,It may not be possible to do two shifts a day.,Please forgive me.。