Albert Einstein in 1893 (age 14). From Euclid, Einstein began to understand deductive reasoning, and by the age of twelve, he had learned Euclidean geometry. Soon after he began to investigate infinitesimal calculus. At age 16, he performed the first of his famous thought experiments in which he visualized traveling alongside a beam of light.
Einstein was said to be a very slow talker as a child. He is said to not have begun speaking until around the age of five, which worried his parents into believing that he might be "slow." Today the term "Einstein Syndrome" is used to categorize exceptionally bright children who display a delay in speech.
November 2015 marks the 100th anniversary of Albert Einstein's general theory of relativity. This theory is one of many pivotal scientific discoveries that would drastically influence our understanding of the world around us.