The inventor of TV set is john baird, a British electronic engineer. In 1923, he applied for a patent for a device that can generate 8 lines of images. The first TV set was sold at the end of 1930.
1932, BBC broadcast the first standardized TV program in the world. Since then, mankind has begun to step into the television era. Today, people use satellites and other channels to spread TV signals to every corner of the earth.
2. Aircraft
Aircraft 1903 12 17, the first powered aircraft begins to fly. 1933, the world's first regular air route was opened, which greatly expanded the space for human activities.
3. Nuclear weapons
The atomic age began at 1942. In order to defeat the Axis fascism, the highest authorities in the United States decided to launch the Manhattan Project aimed at developing atomic weapons. At the end of the year, as part of the Manhattan Project, the first nuclear reactor was built and put into operation under a sports facility of the University of Chicago.
1On July 6th, 945, a mushroom cloud rose from the Atomic Energy Research Center in Los Alamos, New Mexico, USA, and the world's first atomic bomb exploded successfully. On August 6th and 9th of that year, the United States dropped two atomic bombs named "Fat Man" and "Little Boy" in Hiroshima and Nagasaki, Japan.
The Japanese emperor then announced his unconditional surrender. The atomic bomb seems to have made great contributions to the victory of World War II, but mankind has lived in the shadow of terrible atomic weapons ever since.
4. Computer
1943 computer, the computer is the foundation for human society to enter the information age, but it was born because of war. 1943, in order to decipher the German code, the British mathematician alan turing designed the first electromechanical computer named "Giant". Although it is only an imaginary computer for decoding, it initiated the development of computer technology, which is changing with each passing day.
1947, the transistor computer came out; 1959, the integrated circuit computer was born; 1970, computer produced large-scale integrated circuits; Since 1980s, a new generation of microcomputers have mushroomed. On this basis, mankind has ushered in a new network era.
5. Contraceptive pills
1954 the contraceptive invented by American doctor gregory pincus is a mixture of two hormones that inhibit ovulation in women.
Contraceptive pill is listed as one of the greatest scientific achievements in the 20th century because it liberates women from passive childbearing. From then on, women can control their own fertility, decide whether to have children according to their own wishes, and decide when to get pregnant according to their own situation.