Particles can exist in multiple states until observed.

Christianity has around 2.4 billion followers worldwide — the most followed religion.

Archery was the first sport to be included in the Olympics after its original ancient form disappeared from the games.

Genghis Khan killed so many people that it may have cooled Earth's climate by reducing agricultural CO₂ emissions.

Musical chords produce emotional responses partly because of learned cultural associations and partly because of acoustic properties.

The lost city of Ubar is mentioned in Arabian legends.

Sourdough bread is made from a 'starter' — a live culture of wild yeast and bacteria that can be maintained for decades.

Roman gladiatorial games were often less lethal than popular culture suggests — gladiators were expensive to train.

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