1. Inventions of 20 th century: 1924 - Frozen foods 1926 - Rocket engine 1927 - Television 1928 - Penicillin 1930 - Jet engine 1939 - Helicopter 1942 - The electronic computer 1945 - Nuclear energy. 1947 - Microwave 1954 - The polio vaccine. 1958 - Laser. 1962 - Modem. 1964 - The family of mainframes. 1968 – Mouse 1969 - Internet 1972 - Video Games. 1976 - Personal Computer. 1984 - Liquid Crystal Display. 1991 - The World Wide Web.

2. Television TV is a device reproducing the transmitted image. The first theoretical and empirical research conducted in the late 19th century. The basic principle of television was proposed in 1880 by scientists, the American E. Sawyer and Frenchman Maurice Leblanom but finalized and patented it a German engineer Paul NIPK.

3. Electric light bulb Era of familiar light bulb is coming to the end, it's a fact. Today, "Edison's light bulb" - you can tell, last things, though at the time of its invention was a definite breakthrough. Since then, over a century light bulb (incandescent) works covering the life of mankind.

4. Mobile phone A mobile phone is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. By contrast, a cordless telephone is used only within the short range of a single, private base station.

5. T h a n k Y o u F o r A t t e n t i o n !