Frenchman Jean-Pierre Blanchard and American John Jeffries travel from Dover, England, to Calais, France, in a gas balloon, becoming the first to cross the English Channel by air. The two men nearly crashed into the Channel along the way, however, as their balloon was weighed down by extraneous supplies such as anchors, a nonfunctional hand-operated propeller, and silk-covered oars with which they hoped they could row their way through the air. Just before reaching the French coast, the two balloonists were forced to throw nearly everything out of the balloon, and Blanchard even threw his trousers over the side in a desperate, but apparently successful, attempt to lighten the ship.

In a letter dated May 23, 1785, Benjamin Franklin reveals his design for what would later be called bifocal glasses. The Pennsylvania inventor, printer, author, diplomat and American Founding Father had grown tired of alternating between two different pairs of glasses to help his near or far vision. So he came up with an idea to, quite literally, split the difference. Franklin is widely credited as the inventor of bifocals.

On July 6, 1785, the Continental Congress establishes the dollar as the official currency of the newly established United States, paving the way for a national monetary system.