Problem: Prolonged deep-sea diving was first made possible in Europe by the invention of a diving bell in what century?
Answer: 16th

Problem: The word porous literally refers to what characteristic in a substance?
Answer: holes

Problem: Which road in London connects Marble Arch with Hyde Park Corner?
Answer: park lane

Problem: On September 8, 1974, Gerald Ford issued Proclamation 4311 granting a pardon, for crimes that may have been committed, to whom?
Answer:
richard m nixon