1) The word "orange" contains three vowels: O, A, and E.

2) The universe is estimated to be around 13.8 billion years old.

3) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.

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