1) The world's largest desert is the Sahara Desert in Africa, covering an area of about 3.6 million square miles (9.4 million square kilometers).

2) The Hollywood Walk of Fame features more than 2,690 stars embedded in the sidewalk, honoring notable figures in the entertainment industry.

3) The world's first car radio was invented in 1929.

4) The world's oldest known recipe is for beer and is over 4,000 years old.