In 1883 or 1884 (accounts differ), Hermman Einstein brought home a compass and give it to his four or five years old son, Albert. Young Albert Einstein observed that the compass needle always pointed in the same direction and moved without anything touching it. He later stated it was at that moment he realized "something deeply hidden had to lie behind things".
This haunted Einstein for many years and has been noted as the beginning of his fascination with science. and when describing the achievements of Einstein, it is possible to say, simply, that he revolutionized physics.