Part 1 of Essay
Satellite is probably the most useful invention since the wheel. have the capability to let you talk with someone across the nation or let you close a business deal through video communication. Almost everything today is heading towards the use of , such as telephones. At&t has used this communications satellite (top righ ....

Part 2 of Essay
.... research on improving solid- propellant rockets. He is known best for firing the world's first successful liquid-propellant rocket on March 16, 1926. This was a simple pressure-fed rocket that burned gasoline and liquid oxygen. It traveled only 56m (184 ft) but proved to the world that the principle was valid. Gossard Died August 10, 1945. Gossard did not work alone, he was also in partnership with a Russian theorist named Konstantin Tsiolkovsky. Tsiolkovsky was born on September 7, 1857. As a child Tsiolko ....