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Ten Great Inventions of the 20th Century
There are hundreds of scientific inventions in this century, which are closely related to our daily life. They have changed our century and changed our life. They make our life colorful, comfortable and happy. Ten inventions that changed the 20th century were selected by Science World magazine;

1. Zipper 1883, Witcomb Judson invented the zipper. This gadget used by millions of people in the world in their daily lives did not attract people's attention when it was first exhibited at the 1883 Chicago World Expo. 193 1 year began to spread all over the world, widely used in wallets, handbags, backpacks, clothes and pants.

2. integrated circuit 1946, the first 30-ton computer in the United States contains 18000 vacuum tubes. At present, the computer can undertake all its functions, even more. Vacuum tubes are constantly being replaced by smaller and more suitable transistors. As a result, the size and weight of TV sets and radios have also been reduced, and the price of electronic equipment has also been greatly reduced. Eventually, integrated circuits will replace all transistors.

The airplane changed the 20th century. People can travel farther, faster, easier and more comfortable than before. 1880, it took three months to take the fastest train from new york to Los Angeles. The fastest ship takes six months to bypass South America. It only takes six hours to fly today.

4. Airships Before the appearance of airplanes, airships were the only means of air transportation for human beings.

It was the dream of the ancients to breathe in the water with scuba diving. 1942, Castiel and Emile, the engineer, made the dream of the ancients come true. They invented the underwater breathing apparatus. More importantly, they invented air conditioning. When divers dive, the air conditioner can automatically adjust the oxygen supply. Underwater breathing apparatus has made great contributions to human development of the ocean. Air conditioning will also develop space services for human beings.

6. Plaster bandage may be insignificant in many inventions, but it is quite important. 1936 The plaster bandage invented was first used for fracture shaping. Before that, if a person breaks a bone, it may lead to death.

7. nylon 100 years ago, almost all clothing materials were made of plant fibers or animal fur. 1938, American Nemore invented nylon. Within two years, parachutes began to use nylon cloth, and women wore nylon stockings. Nowadays, most fabrics contain a lot of nylon. Nylon is called the ancestor of hundreds of synthetic raw materials used by human beings.

8. Rockets are widely used for meteorological detection and launching various satellites and spacecraft. 1924 American Robert's small rocket only shot 220 feet into the air. Today's rockets can launch satellites to an altitude of 22,800 miles.

9. Television 1930, farnsworth invented the television system at the age of 2 1. 1931July 2 1 day, the world's first TV broadcasting station came out. At present, television is being further popularized and developed.

10. Refrigerator 1926 The first refrigerator was invented by Platon, a Swede. It is a good helper in human life. At present, together with TV sets, it has become an indispensable part of electrification in many families.