Watch videos about Hugh Hefner and how he turned 'Playboy' magazine into a worldwide empire that played a role in the sexual revolution of the 1960s.

Watch short videos about Founding Fathers of the U.S. including  George Washington, Alexander Hamilton, Thomas Jefferson, Benjamin Franklin, John Adams, Samuel Adams, Paul Revere and John Hancock.

Watch videos about the high-flying achievements of Bessie Coleman, Amelia Earhart, Charles Lindbergh and other famous aviators.

Watch videos about the trailblazing achievements of famous scientists including Albert Einstein, Madame Curie, Charles Darwin, Louis Pasteur, Nikola Tesla, Ernest Rutherford and more.

Watch videos about the lives and travels of famous explorers including Christopher Columbus, Marco Polo, Amerigo Vespucci, Ferdinand Magellan, Henry Hudson, Hernan Cortes, Ponce de Leon and more.