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.

Learn about the landmark Supreme Court decision in Loving v. Virginia, which legalized interracial marriage in the United States.