Korfbal is a ball game similar to netball in which men and women play alongside each other but separately – a team consists of four men and four women who can only attack or defend against people of the same sex. Korfbal was invented by Dutch schoolteacher Nico Broekhuysen who adapted a game he saw in Sweden in 1902 by replacing the hoop with a basket (korf). It is now played in 50 countries.