Facial expressions are recognized across many cultures.

The first modern Olympic Games were held in Athens in 1896 with 14 nations participating.

At the 1936 Berlin Olympics, Jesse Owens was publicly congratulated by Hitler's rival Adolf Hitler — contrary to the popular myth.

Kenyan marathon runners dominate due to a combination of high-altitude training, genetics, and lean running economy.

The Olympic rings represent the five continents of the world — but no particular ring is tied to a specific continent.

Hip-hop culture originated in the South Bronx in the early 1970s and encompasses DJing, MCing, breakdancing, and graffiti art.

The first text message ever sent read 'Merry Christmas' and was sent on December 3, 1992.

The typewriter improved document production efficiency.

Particles can exist in multiple states until observed.