Dutch National Archives
Air conditioning is born, the "happiest place on Earth" opens up, and the Beatles get animated, all on this day.
1790: Scottish philosopher and economics pioneer Adam Smith dies at age 67 in Edinburgh, Scotland. Smith is best known for his two classic works, "The Theory of Moral Sentiments" and "An Inquiry into the Nature and Causes of the Wealth of Nations," the latter of which is considered the first modern work of economics.
On the morning of April 19, 1995 Timothy McVeigh killed 168 people during the Oklahoma City bombing. Find out more about that tragedy here.