It takes no more than 20 moves to solve the Rubik’s Cube.
Earth's rotation reaches a speed of half a kilometer per second.
Elephants are the only animals that can’t jump.
Lions are the only cats that do not purr.
The first city in the World that has reached one million inhabitants was Rome, around 133 BC. London got its one million inhabitants in 1810, and New York in 1875. Today, there are over 300 cities with more than a million inhabitants.
Heroin was once used as a cough medicine.
