The concept of 'catharsis' in theater was described by Aristotle — tragedy purges emotions through pity and fear.

Operation Northwoods was a proposed U.S. plan in the 1960s that was never carried out.

Particles can exist in multiple states until observed.

The musical scale we use today was standardized at A = 440 Hz only in 1939 — different standards were common before then.

High jumpers use the Fosbury Flop — jumping backwards over the bar — introduced by Dick Fosbury at the 1968 Olympics.

Jazz is one of the few art forms considered uniquely American in origin, developed in New Orleans in the early 1900s.

Abraham Lincoln was a licensed bartender.

The Mona Lisa was considered an unremarkable painting until it was stolen in 1911 — the resulting publicity made it famous.

Rowing is considered one of the most physically demanding Olympic sports, requiring near-maximal effort for about 6 minutes.