The first point: the magnetized water in history The compass of one of the four great inventions of ancient China, magnetic force is one of the four basic forces of nature. It is an example of the clever application of magnetic force. Li Shizhen, a medical scientist of the Ming Dynasty, discovered that the magnetically treated water had a "de-scarred, long-skinned" long drink that was so good that it was suitable for drinking "aphrodisiac" (see "Compendium of Materia Medica" 583586. Page) can strengthen the body and treat a variety of diseases. However, the magnetic data applied by the ancients is a naturally occurring natural magnet-strong magnetite, and its magnetic properties are very low compared with modern synthetic magnetic materials.
The second point: high-strength magnetic king - NdFeB strong magnet third generation NdFeB strong magnet - Fe-B came out, 1983. Its magnetic field strength is more than ten times that of ordinary magnets, and its service life is more than ten years. The magnetic energy product discovered by human society so far (known as "Magnetic King" is widely used in national defense, aerospace technology, microwave, communication, electronics, medical High-tech fields such as health care.