Competitive swimming only standardized pool lengths to 50 meters for the Olympics in 1924.

Celtic mythology featured a world beyond death called the Otherworld — not a punishment but a paradise.

Particles can exist in multiple states until observed.

Project Blue Book investigated reports of unidentified flying objects.

Pianos have over 12,000 individual parts and are considered both string instruments and percussion instruments.

Hinduism is considered the world's oldest living religion, with texts dating back to at least 1500 BC.

Weightlifter Lasha Talakhadze set a world record by lifting 265 kg in the clean and jerk at the 2021 Tokyo Olympics.

Music can influence mood and emotional state.

The 16th Amendment authorized a federal income tax.