It was the bloodiest battle ever in the Western Hemisphere. For 3 days in July 1863 Americans slaughtered each other on a terrible scale around a small town in Pennsylvania, where the honored dead "gave the last full measure of devotion".

Find out why Robert E. Lee invaded the north, and why he failed so terribly; why the civil war dragged on for almost two more years after this union victory; and how this conflict inspired one of the greatest speeches ever in the English language.

Galileo is considered the father of modern science. His discoveries included the laws of pendulums which led to the development of the first accurate clocks. But tragically, he was tried by the Inquisition of Rome for heresy. The science deniers of the Church threatened to burn him at the stake unless he recanted his claims that he could prove that Copernicus was right: that the Earth is not the center of the universe, that we live in a heliocentric system where the earth and the other planets revolve around the sun.

A lot of elements contributed into winning World War II: Britain refusing to make peace with Nazi Germany after the fall of France along with the Chinese and Soviets willingness to suffer millions of deaths. But World War II was a war between the factories; whichever side could produce the most military equipment would win. The deciding factor in World War II was the fantastic industrial output of the U.S.