In what year did Buzz Aldrin walk on the Moon?

Want a collectible? You might find it, or sell one, at which online auction site started in 1995? Americans can buy U.S. savings bonds from which government department, founded in 1789? Buying one of which company's DynaTAC phones in 1984 could have cost you about $4,000? Buzz Aldrin left NASA in 1971 and became commander of the test pilot school at which California Air Force base? By some measures the largest organism is a 2,385-acre honey mushroom in Oregon, nicknamed the "Humongous" what? "Bwana", meaning "sir" or "master", comes from which African language? By 1018, Emperor Basil II, the "Bulgar Slayer", had put the Balkan Peninsula under which empire's control? Amman had faded by 1300; which empire resettled it in 1878, after which it grew?