Michael Faraday, a British physicist and chemist, was one of the greatest experimentalists of the nineteenth century. The son of a blacksmith, Faraday received a minimal education, which did not include much training in mathematics. Nevertheless, in 1812 his innate intelligence attracted the attention of Sir Humphry Davy at the Royal Institution. Davy hired Faraday as a laboratory assistant in the institution; Faraday remained until his retirement in 1862. Here, he made his contributions to the study of electricity by formulating the laws of electrolysis in 1834. Faraday also discovered that the circular lines of magnetic force produced by the flow of current through a wire deflect a nearby compass needle. By demonstrating this conversion of electrical energy into motive force, Faraday identified the basic principles governing the application of the electric motor. Simultaneously with Joseph Henry, Faraday discovered electromagnetic induction and then successfully built the first electric generator based on a suggestion from Scottish mathematician and physicist Lord William Thomson Kelvin. After a series of experiments using polarized light, Faraday proposed an electromagnetic theory of light. This theory was later developed by James Clerk Maxwell and was fundamental to the later development of physics. Faraday was widely known as a popularizer of science, regularly lecturing to lay audiences from 1825 to 1862. Faraday was an extremely modest person. For example, he declined honors bestowed in recognition of his accomplishments, such as a knighthood and the presidency of the Royal Society.