1) 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.

2) The "Star Wars" franchise, created by George Lucas, has become a global phenomenon with numerous films, TV shows, books, and merchandise.

3) The Cuban Missile Crisis in 1962 brought the United States and the Soviet Union to the brink of nuclear war during the Cold War.

4) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.