1) The name "Bluetooth" comes from the 10th-century Danish king, Harald Bluetooth, who united Denmark and Norway.

2) The word "piano" contains three vowels: I, A, and O.

3) Political ideologies such as liberalism, conservatism, socialism, and communism shape and influence policies, governance, and societal values in different countries and contexts.

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