Inca architecture uses no mortar — stones are fitted so precisely that a knife blade cannot pass between them.

Carthage was destroyed by Rome in 146 BCE.

The first woman to complete the Boston Marathon officially was Kathrine Switzer in 1967, despite officials trying to pull her off the course.

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

Biomass burning — including agricultural fires — produces more greenhouse gas than global aviation.

Olympic weightlifters follow a precise diet and weigh in the day before competition to make their weight category.

The Reformation reshaped religious life across Europe.

Usain Bolt's top recorded speed during his 100m world record was 44.72 km/h (27.8 mph).

The oldest known martial art is wrestling, depicted in cave paintings in France dating to 15,000 BC.