1) The word "school" contains two vowels: O and O.

2) The shortest scheduled commercial flight lasts just 1.7 miles and connects two Scottish islands, Westray and Papa Westray.

3) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

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