1) The world's largest desert is the Antarctic Desert, covering around 5.5 million square miles.

2) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.

3) The world's tallest waterfall is Angel Falls in Venezuela, with a height of about 3,212 feet (979 meters).

4) The shortest war in history lasted only 38 to 45 minutes between Britain and Zanzibar in 1896.