Misc: An astronomer named Percival Lowell founded this observatory in 1894?

Questions

6th space shuttle mission, Challenger 1 launched?

Winston Smith in Orwell's "1984" begins his secret diary?

Gloria Estefan released from the hospital after her accident?

B.C. Noah's ark grounded, Mt Ararat (calculated date)?

Alexander Nevsky of Novgorod defeats Teutonic Knights?