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

2) The American Civil Rights Movement, led by figures like Martin Luther King Jr., fought for equal rights and helped bring about significant social and legislative changes.

3) Michael Jackson's album "Thriller" is the best-selling album of all time, with estimated sales of over 66 million copies worldwide.

4) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.