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Discoveries and inventions

Discoveries and inventions Inventions are great. Although many of the inventions that seems trivial today, they revolutionized the era in which they appeared. Let's see how much do you know about them!

Question 1 from 11: In what year were launched the first cards or "plastic money" as they were called?
Question 2 from 11: American physicists John Bardeen, Walter Brattain and W. Shockley made the first transistors that functioned just like the thermo-ionic valves but they were smaller and were consuming much less. In what year did the first transistors appeared?
Question 3 from 11: Clarence Birdseye produced the first frozen food in the world. What whas the year when this happened?
Question 4 from 11: In what year did German car engineer Karl Benz built the first car?
Question 5 from 11: When did the South African cardiologist Christiaan Barnard made the first heart transplant?
Question 6 from 11: In what year was the first skyscraper built and where?
Question 7 from 11: When and where was the first underground in the world?
Question 8 from 11: In what year was the airplane invented by Wilbur and Orville Americans known as the Wright Brothers?
Question 9 from 11: The american, Thomas Adams made the first time chewing gum based on a recipe of Maya Indians. In what year was chewing gum invented?
Question 10 from 11: The German chemist Felix Hoffman invented aspirin to try to treat his father's rheumatism. In what year was aspirin invented?
Question 11 from 11: The German chemist Felix Hoffman invented aspirin to try to treat his father's rheumatism. In what year was aspirin invented?