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

2) The first modern Olympic marathon race was held at the 1896 Olympics in Athens and has since become one of the most iconic and challenging events in athletics.

3) Orchids are one of the largest families of flowering plants, with over 25,000 species.

4) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.