1) The sport of golf originated in Scotland and is played on courses with 18 holes, each with a designated par score.

2) The world's first credit card was introduced in 1950 by Diners Club.

3) The Sahara Desert, located in North Africa, is the largest hot desert in the world, covering an area of about 9.2 million square kilometers (3.6 million square miles). It is characterized by vast stretches of sand dunes, rocky plateaus, and extreme temperatures.

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