useless trivia: What Word Means: A Transverse Fissure?

Questions

In 1965 ---------- assassinated.?

In 1981 Charles ---------- clearly says a four-letter word on Saturday Night Live.?

In 1630 Popcorn is introduced by an ---------- named Quadequina to the English colonists at their first Thanksgiving dinner.?

In 1732 George---------- , father figure for U.S., President (1789-1796), born.?

In 1749 Johann Nikolaus---------- , musicologist and first biographer of Bach, born.?