useless trivia: What Word Means: A Kind Of Hard Roll In The Shape Of A Doughnut?

Questions

Which ex-president died in 1973, five days before an agreement was signed in Paris ending the fighting in Vietnam?

What roars in the 'roaring forties?

What Russian city's name translates to 'ruler of the east?

What Shakespearean play features the line 'a plague on both your houses?

What shuttle launch merited the Time cover headline - whew?