What is a fascinating fact you know that I probably don't, but should?

Here are 10 fascinating facts that you might not know yet:

• Bananas are berries, but strawberries are not berries.
• Octopuses have three hearts and blue blood.
• There are more possible iterations of a game of chess than there are atoms in the observable universe.
• The shortest war in history was between Zanzibar and the United Kingdom, lasting only 38 minutes.
• The world's oldest piece of chewing gum is over 9,000 years old.
• A group of flamingos is called a flamboyance.
• Elephants can communicate with each other through vibrations in the ground.
• In Japan, letting a sumo wrestler make your baby cry is considered good luck.
• The first recorded game of baseball was played in 1846 in Hoboken, New Jersey.
• The tallest mountain in the solar system is Olympus Mons, located on Mars.