51. The ontological argument for the proof of God's existence is first attributed to whom?
52. John Moses Browning, the designer of the M1918 BAR (Browning Automatic Rifle) was a part of which religion?
53. According to scholarly estimates, what percentage of the world population at the time died due to Tamerlane's conquests?
54. When did the United States formally declare war on Japan, entering World War II?
55. What was the total length of the Titanic?