1) The Industrial Revolution led to significant urbanization, as people migrated from rural areas to cities in search of employment in factories.

2) Elvis Presley, often referred to as the "King of Rock and Roll," has sold over one billion records worldwide.

3) Norse mythology, originating from the Scandinavian region, features gods and mythical creatures like Odin, Thor, Loki, and Valkyries. It explores themes of heroism, destiny, and the battle between gods and giants, with intricate tales recorded in texts such as the Prose Edda and Poetic Edda.

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