Samuel "Sammy" Herman Reshevsky (1911 – April 4, 1992) learned to play chess at age four and went on to become a leading American chessgrandmaster. At age eight, he was beating many accomplished players.

Wolfgang Amadeus Mozart (1756 –1791) showed prodigious talent in music from his earliest childhood. Already competent on keyboard and violin – and better than his sister who was five years older – he composed from the age of five and performed before European royalty.

Srinivasa Ramanujan (1887 – 1920) encountered formal mathematics for the first time at age 10. By age 11, he had exhausted the mathematical knowledge of two college students who were lodgers at his home. He made extraordinary contributions to mathematical analysis, number theory and infinite series.