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 oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

3) The windshield wipers were invented by a woman named Mary Anderson in 1903.

4) The concept of sovereignty refers to the supreme authority and power of a state to govern itself, make decisions, and control its own territory without interference from external forces.