Какие достижения техники и технологии 20-го века, вы считаете самыми значительными для человечество и почему?

1) Hubert Cecil Booth, from London, invented a machine powered by electricity which would suck up dirt. his invention was granted a patent in 1901 as the world`s first vacuum cleaner.

2) In 1923, a watch repairer from the Isle of Man, John Harwood, realised that winding watches often caused dirt to get into the mechanism. He developed the self-winding wristwatch, which had an internal mechanism and was much more accurate.
 
3) One invention which helped to make the world a smaller place was the jet engine. This was invented by Sir Frank Whittle, from Cventry. His invention made travel for business and pleasure much faster and easier.

4) In 1995, Keith Campbell and Ian Wilmut, from Edinburgh, developed an invention which people have been arguing about ever since. They invented a way to clone animals, and ib 1997, Ian Wilmut cloned Dolly the sheep.