What were two major technological developments of the 1950s?
There were many scientific discoveries made in the 1950's, but here are the most important ones.-1950-Tritium, a hydrogen isotope, is discovered for use in the H-bomb.-Dr. Richard Lawler performs first kidney transplant. - See more at: http://www.chacha.com/question/what-were... First artificial heart component is used. -Transistors replace vacuum tubes in radios and T.V.'s. Jonas Salk's polio vaccine is proved to prevent polio. -The structure of DNA is discovered. -The Bell X-1A beaks the sound barrier -1955 -Oral Contraceptive pill is developed. -1957 -Sputnik 1 is launched by USSR and orbits Earth. -Sputnik 2 carries a dog into space. http://jaj50s.tripod.com/tech.html
What major happened in America in the 1920's?
Prohibition (of alcoholic beverages) Gangsters - related to illegal alcohol Much optimism and idealism in the beginning Economic collapse in the end (the Great Depression) Political isolationism (avoid a new war which lead to a new war) Automobiles became popular.
What was the major purpose of the Five-Year Plans during the 1920s and 1930s in the Soviet Union?
They were production guidelines, or goals for farms and industries. God Bless you.