1) The first commercially successful video game was "Pong," released in 1972 by Atari.

2) The highest mountain in Africa is Mount Kilimanjaro, standing at 19,341 feet (5,895 meters) tall.

3) The Triple Crown in horse racing consists of three prestigious races: the Kentucky Derby, the Preakness Stakes, and the Belmont Stakes.

4) The tongue of a blue whale is so big that about 50 people could stand on it.