The gravitational constant G, central to the law of gravitation published in 1687, is also known as whose constant?

Composer Sergei Rachmaninoff lent which Russian-born novelist money to come to the U.S. in 1940? Which composers are known as "the three Bs"? Computers that read "00" as which year needed fixing before 2000? In 1915 Arthur Conan Doyle wrote a tribute on the death of W.G. Grace, a superstar of which sport? Conceived by store employees, which department store's Thanksgiving Day parade debuted in New York City in 1924? Which Soviet leader faced off with President John F. Kennedy during the 1962 Cuban Missile Crisis? In 1773, John Adams wrote in his diary, "This is the most magnificent Movement of all," about which event? Which author concluded his four-book Berrybender Narratives with the 2004 novel "Folly and Glory," featuring Kit Carson…