1. Blood transfusion

In p>19, Karl Rand discovered human blood type, which made blood transfusion possible.

2. Aspirin

Aspirin In 1897, felix hoffman, a German, synthesized acetylsalicylic acid, which was registered as aspirin two years later and became the most popular medicine a century later.

3. Watches

Watches, one of the inventions with many changes in human history, appeared in 194.

4. Credit card

In the history of credit card money in p>192, the appearance of credit card was the biggest revolution since the appearance of money. The first credit card was issued in the 192s, and the commonly used credit card was issued in 195.

5. Penicillin

Penicillin in p>1928: It is said that penicillin is the most contribution medicine in this century, and its inventor was British bacteriologist alexander fleming.

6. Television

In p>1923, the kinescope, the soul of television, was born. Television technology was widely used in the 194s, and in 1954, it started the era of color television. After the 196s, almost all countries established television stations, and this box created countless happy times for mankind.

7. Plastics

The invention of plastics can be regarded as a masterpiece of mankind in the 2th century. Plastic has undoubtedly become an indispensable and important raw material in modern civilized society. At present, plastics have been widely used in aviation, aerospace, communication engineering, computer, military, agriculture, light industry, food industry and other industries.

8. Internet

In the 2th century, one of the great influences of communication technology on human society was the Internet formed by connecting many computers with communication technology.

9. Aircraft

On December 17th, 193, the first powered aircraft began to fly. In 1933, the world's first regular air route was opened, which greatly expanded the space for human activities.

Reference: Baidu Encyclopedia-Inventions of the 2th Century.