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

2) The French Revolution, which began in 1789, marked a major turning point in European history, leading to the overthrow of the monarchy and the rise of republicanism.

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

4) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.