1900, the German scientist Planck discovered that when atoms split, they would release enormous energy, which he called "Quart", which was hailed as the great discovery of the century.
2. Copying machine
Chester Carlson, the inventor of the copier, was originally a patent lawyer, part-time researcher and inventor. His job in new york Patent Office requires copying many important documents. Carlson suffers from arthritis and regards copying documents as a painful and monotonous job.
This encouraged him to conduct photoconductivity experiments and estimated that he could copy them in the simplest way. Carl Johnson conducted an electrophotographic experiment in his kitchen, and applied for a technology patent at 1938.
3. 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.
4. Air conditioning
1906, Stuart W. Cramer of Charlotte, North Carolina, USA, was looking for ways to increase the air humidity in his southern textile factory. Kramer named this technology air conditioning, and used it as a substitute for air conditioning in the same year.
The regulation of water was a famous procedure at that time, which made the production of textiles easier. He combined steam with ventilation system to "adjust" and change the air in the factory and control the extremely important air humidity in the textile mill. Willis Carrier used this name and wrote it into the company name established in 1907: "Galia Air Conditioning Company of America".
5. cars
19 13, the automobile assembly line of Henry Ford, an American automobile manufacturer, officially started, which reduced the cost, improved the efficiency, and made cars enter the homes of ordinary people, becoming a decisive event in this century.
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