useless trivia: What Word Means: A Quilted Eiderdown?

Questions

Whose motto is "we learn by doing?

Whose tees are closer to the green in golf men's or women's?

Wild Bill Hickok was shot in the back by a stranger during a poker game. The hand he was holding aces & eights is known to poker players as what?

With which sport is Michael Andretti identified?

Word meaning 'center of gravity?