Did you know the playground game of Four Square has no single known inventor, but it dates back to at least the 1950s in the United States ? (A teacher's manual from 1953 contains the earliest formal description of the rules, which closely match how the game is played today.)

Did you know the game of Jacks was not invented on a single specific date, but evolved from an ancient game called knucklebones that dates back thousands of years to at least 5000 BC ? (Archaeologists have found evidence of early versions of the game in prehistoric caves, ancient Egyptian murals, and depictions on Greek pottery. Over centuries, the animal bones were replaced by small stones, wood, or seeds (popular during Colonial times). The modern game—featuring a small rubber bouncing ball and metal or plastic six-pronged pieces—took shape after the invention and mass production of vulcanized rubber balls in the 19th and 20th centuries.)

Did you know UNO was invented in 1971 by Merle Robbins, a barber from Reading, Ohio to settle an argument with his son about the rules of Crazy Eights ? (He wrote specific action rules directly onto regular playing cards using a pen. He and his wife mortgaged their home for $8,000 to print the first 5,000 decks, which they sold out of his barbershop. "Uno" means "one" in Spanish and Italian. Robbins sold the rights to the game in 1972 for $50,000 plus royalties, and Mattel eventually acquired it in 1992.)

Did you know "Spin the Bottle" was not invented by a single person and written records of bottle-spinning games go back to the 1920s, though early versions did not involve kissing ? (Early printed records mention spinning-bottle parlor games, such as a 1927 game called "Bottle of Fortune". It was in the 1940s–1950s that the familiar phrase and kissing game took root among teenagers in North America .)

Did you know "Rock Paper Scissors " originated in China during the Han dynasty (206 BC to 220 AD) ? (Early Chinese writers recorded hand-matching games called shoushiling during the Han era. These early games used different animal or object symbols instead of rock, paper, and scissors. The first written mention of these ancient ancestor games appears in the book Wuzazu, written by the Ming dynasty author Xie Zhaozhe in the early 1600s.)