Inventions and Discoveries

71. Who discovered the principle of buoyancy?
a) Archimedes
b) Pythagoras
c) Euclid
d) Aristotle

72. Who invented the dynamo?
a) Michael Faraday
b) James Clerk Maxwell
c) Thomas Edison
d) Nikola Tesla

73. Who discovered the law of gravitation?
a) Isaac Newton
b) Galileo Galilei
c) Johannes Kepler
d) Albert Einstein

74. Who invented the electric motor?
a) Michael Faraday
b) Thomas Edison
c) Nikola Tesla
d) George Westinghouse

75. Who discovered the structure of DNA?
a) Francis Crick and James Watson
b) Rosalind Franklin and Maurice Wilkins
c) Linus Pauling
d) Barbara McClintock