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

2) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.

3) The speed of light is approximately 299,792,458 meters per second.

4) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.