The superstition of Friday the 13th being unlucky has a name — paraskevidekatriaphobia.

The Mona Lisa was considered an unremarkable painting until it was stolen in 1911 — the resulting publicity made it famous.

Dressage — precision horse riding — scores horses and riders on over 30 individual movements in a freestyle routine.

The world's largest drum, Tridandi, is over 13 feet in diameter and weighs 2,000 kg.

Van Gogh sold only one painting during his lifetime.

Freestyle skiing's halfpipe event requires athletes to complete tricks at heights of up to 7 meters above the pipe's lip.

Arguments about money are among the most common relationship disagreements.

The sitar, fundamental to Indian classical music, has 21 strings — 7 played and 14 sympathetic.

The word 'checkmate' in chess comes from the Persian phrase 'Shah Mat' meaning 'the king is dead.'