Inventions and Discoveries

41. Who discovered the law of gravity?
a) Isaac Newton
b) Galileo Galilei
c) Albert Einstein
d) Stephen Hawking

42. Who invented the first battery?
a) Alessandro Volta
b) Michael Faraday
c) Benjamin Franklin
d) Thomas Edison

43. Who discovered X-rays?
a) Wilhelm Conrad Roentgen
b) Marie Curie
c) Henri Becquerel
d) J.J. Thomson

44. Who invented the light bulb?
a) Thomas Edison
b) Joseph Swan
c) Nikola Tesla
d) Benjamin Franklin

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