3-year-olds predict future.

In Brain Development, Brain Science, Memory and Learning by Brainy Days Ahead

Scientists at King’s College London tested children aged three to gauge intelligence, language and motor skills. They also tested the children on their levels of tolerance, restlessness, impulsivity and social disadvantage. After 35 years, one fifth of the group was responsible for 81 per cent of the criminal convictions; three quarters of drug prescriptions; two thirds of welfare benefit payments and more than half of nights in hospital. But the outcome could have been predicted decades earlier, simply by looking at which children attained the lowest test scores aged three.