music: Category: Artists: Ex-Beatle who appeared on Tom Petty's "I Won't Back Down"?

Questions

Antarctica discovered by U.S. Navy Captain Nathaniel B. Palmer.?

Sir W.S. Gilbert, playwright (of Gilbert and Sullivan fame)?

U.S. and Canada begin the use of standard time zones (standard time zones established by the railroads in both countries).?

Oahu Railway begins public service in Hawaii.?

George H. Gallop, pollster (what's your opinion?)?