Bioluminescence is at least 80% efficient (less than 20% of the energy used goes to heat). For comparison, an incandescent lightbulb may be as much as 10% efficient.

Early mechanical clocks did not have faces or hands – they only indicated time by striking at the hours.

The Mars flag (not official, but approved by the Mars Society and the Planetary Society) has been flown in space. An astronaut took the flag onto the shuttle Discovery on a mission to service the Hubble telescope.

The current heir of the House of Stuart is Duke Franz of Bavaria. The last Stuart heir to make a public claim on the British throne was Cardinal Henry Benedict Stuart, who died in 1807.

Most translated books were originally written in English – 920,595 since UNESCO started tracking book translations. The second most popular original language is French, with 172,104.

Paul von Hinderberg was the last President of Germany before Hitler took power – he ran for reelection in 1932 at the age of 84 in an attempt to prevent Hitler from being elected. He won the election, but died in 1934.

Cats average 13-14 hours of sleep per day; some will sleep as much as 20 hours.

The Casbah is the citadel of Algiers and the surrounding neighborhood. The Casbah Club was a club in the basement of Pete Best’s mother’s house – one of the first clubs that The Beatles played in.

Botanically, a berry is a fruit with multiple seeds – raspberries and blackberries don’t count because they are aggregate fruits. Tomatoes, chiles, and kiwifruits are berries.

Africa and Asia were both names of Roman provinces before they were names of continents, The province of Asia was in what is now western Turkey, and what was the province of Africa is now roughly Tunisia and part of Libya.