Charles Spearman was born in 1863 and died in 1945. He was a British psychologist and his belief was that are two types of
intelligence. One type is called "g" for general intelligence and the other is called "s", which represents
a number of specific abilities. Spearman believed that the important information to have about a person's intellectual ability
is an estimate of their "g". This is because he believed that if you knew how a person performs on a "g"
task, then you could safely perdict how that person would do on another "g" task.