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

2) A group of flamingos is called a "flamboyance."

3) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

4) The Alps, located in Europe, are a popular destination for skiing, mountaineering, and hiking.