The word 'clue' originally referred to a ball of thread — in Greek mythology, Ariadne gave Theseus a thread to escape the labyrinth.

The modern triathlon — swim, bike, run — was invented in California in 1974 as a way to settle debates about which sport produced the fittest athletes.

Prehistoric cave paintings provide insight into early humans.

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

Facial expressions are recognized across many cultures.

Tug of war was in the Olympics from 1900 to 1920.

Haiku poetry traditionally captures a moment in time, contrasting a seasonal reference (kigo) with a cutting word (kireji).

In 1518, a dancing plague reportedly caused people in Strasbourg to dance uncontrollably for days.

The Reformation reshaped religious life across Europe.