Americans can buy U.S. savings bonds from which government department, founded in 1789?

Butch Cassidy was reportedly killed near San Vicente in which South American country in 1908, though doubts remain? Butch Cassidy's first big crime was the 1889 holdup of the San Miguel Valley Bank in Telluride, in which state? Button Gwinnett was killed in a duel in May 1777, ten months after signing which document? Want a collectible? You might find it, or sell one, at which online auction site started in 1995? 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? In what year did Buzz Aldrin walk on the Moon? By some measures the largest organism is a 2,385-acre honey mushroom in Oregon, nicknamed the "Humongous" what?