1) The musical "Les Misérables" is one of the longest-running shows in the West End and Broadway, with over 13,000 performances.

2) The Treaty of Versailles, signed in 1919, officially ended World War I and imposed heavy penalties and reparations on Germany.

3) The world's largest ocean, the Pacific Ocean, covers an area of approximately 63 million square miles.

4) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.