These lectures by a famous inventor offer an easy-to-understand introduction to the interactions of the universe's physical forces. Michael Faraday (1791–1867) delighted in introducing young minds to scientific inquiry, and he geared these talks to audiences of high school age and older. One of the world's greatest experimental philosophers and popularizers of science, Faraday conducted the experiments that made electricity viable for technological use. In these six lectures, he offers a captivating introduction to concepts related to some of his most important discoveries. Topics include gravitation, cohesion, chemical affinity, heat, magnetism, and electricity.