What was the most famous invention more than 2,000 years ago

The description is an invention of BC. I think it's Sinan.

Compound interest is arguably the greatest invention of the 20th century.

As long as anything is stained, it will grow in geometric multiples, and the application of our compound interest level exists in all walks of life, whether it is financial loans or even the development of other machine components, they are the existence of compound interest, if you can have such thinking to invest in your personal life.

If there is a 10% income every month, then how long will you have a principal of 100,000 yuan, the answer is 72 months, that is, 6 years, 100,000 becomes 1 100 million in 6 years, this compound interest is quite awesome.

But it takes 24 months to go from 10 million to 100 million, that is, 2 years, and it is unlikely to get 10% of the income every month, but it is much easier to achieve 10% growth every year, and even 20% is not impossible.

The above calculation is based on the income of 10% per month, it is much easier to achieve the month for the adult, just mentioned that it takes 49 months to 100,000 to 10 million, if it is 10% per year, that is, 49 years. It takes 24 years for 100,000 to 1,000,000.

Suppose we think of our life as compound interest, and you design your own basic only one dollar, but through your own efforts to earn the first pot of gold 10,000 yuan, and then realize the thinking investment model of compound interest, to achieve annual growth, then after 10 years, 20 years will continue to show compound interest growth, wealth accumulation.

So basically it is able to reach the geometric level of the guarantee, assuming that there is only 100,000 yuan, then after the growth of the compound interest level, then you may be hundreds of billions of assets in more than ten or twenty years, although we say that we do not necessarily require the thinking of compound interest to double the annual growth of their money, as long as the annual growth rate can be as high as 30%, then you have surpassed Buffett.

The greatest inventions of the 20th century were the Haberbosch ammonia method and the vaccine.

1. Haberbos ammonia production method.

In the early 20th century, the German chemist Fritz Haber felt that the rapid growth of the world's population had put enormous pressure on agriculture, and agricultural products could no longer keep up with demand. Later, Haber pioneered the invention of ammonia from nitrogen and hydrogen, which can be used to produce fertilizer.

Lots of fertilizer. It now appears that Haber's research is enough to feed one-third of the world's population, and half of the body's protein is made up of nitrogen. Although few people remember the Haberbosch ammonia production process now, it was the most important industrial invention of the 20th century.

Any invention that can solve the problem of feeding billions of people around the world is a great achievement that can change the world.

2. Vaccines.

Every year, about 10,000 cases of disease in the United States can be prevented by vaccines. It has recently been pointed out that there may be a link between vaccines and autism, but this does not take away from the importance of vaccines. Every year, around 3 million people die globally because they don't have access to vaccines.

There are many diseases that vaccines can help humans fight off, including polio, diphtheria, whooping cough, measles, mumps, rubella, avian pox, hepatitis A, hepatitis B, shingles, and many more. It is estimated that about 3 million people are saved each year because of the vaccine. Vaccines are as important as the antibiotics discovered in 1945, which can bring countless people back from the brink of death.

The greatest invention was the hybrid rice.

The people take food as the sky, if there is no food to eat, it is empty words to say anything, hybrid rice fills the stomach of the people, and only then can there be more surplus value to create more things, so hybrid rice is the greatest.

No invention is the "most" great. For different people, there is a so-called "most". For a terminally ill patient, a drug that can ** him may be the most "great" invention for him.

Just as there are a thousand Dream of Red Mansions in the eyes of a thousand readers, so are the so-called great inventions.

Human inventions of the 50s of the 20th century: credit cards, cable television, power steering wheels, pocket transistor radios, soft drinks, video recorders, non-stick cookware, theme parks (the first of Disneyland), correction fluids to correct typewriter errors, building toys for children, hydrogen bombs, hydrofoils, oral contraceptives, modems, lasers, fitness hula hoops.

In late 1902, the first modern, electrically propelled air conditioning system was invented by Willis Carrier (1876-1950). The difference between the design and the wolff's design is that it not only controls the temperature, but also controls the humidity of the air to improve the quality of the production process in a printing house in Bucklin, New York.

The atomic bomb, in August 1945, the earth-destroying Bundora's box was opened in Hiroshima and Nagasaki, Japan, when the international powers were bent on overwhelming each other with this powerful and deadly destruction**. The United States first successfully tested an explosion in New Mexico in July 1945, followed by the Soviet Union in 1949, the United Kingdom in 1952, France in 1960, and China in 1964.

Personally, I think the greatest invention of the 20th century is the nuclear ** represented by the atomic bomb.

Because of the nuclear and nuclear balance, the world war ended, a bigger world was avoided, and the world as a whole achieved peace.

Space Shuttle In 1959, the Soviet Union's unmanned spacecraft successfully landed on the moon for the first time, and a large number of ** were returned. The Apollo moon landing in the late 60s was the first step for mankind to set foot on a planet other than Earth, and since then, the United States has gradually left the Soviet Union behind in space exploration. With the advent of the Space Shuttle, the chances of success in traveling to outer space have increased dramatically, and scientists predict that humans will travel to outer space after the year 2000 AD.

Nanjing Jinling Institute of Science and Technology, ahh