1. In 1752, Benjamin Franklin conducted his famous kite experiment during a thunderstorm in Philadelphia. The experiment proved that lightning was a form of electricity, and led to the invention of lightning rods.

2. In 1783, George Washington resigned his commission as commander-in-chief of the Continental Army at the Maryland State House in Annapolis, Maryland. After resigning, he traveled to Philadelphia, where he met with the Continental Congress and was hailed as a hero.

3. In 1862, the Battle of Jeffersonville took place in Indiana during the American Civil War. Confederate forces under General Braxton Bragg attempted to capture a Union supply depot in the town of Jeffersonville, but were repulsed by Union forces under General John T. Wilder.

4. In 1904, President Theodore Roosevelt visited the coal-mining town of Scranton, Pennsylvania, to meet with miners and discuss worker safety and labor issues. Roosevelt was known for his progressive views on labor and workers' rights.

5. In 1917, Penn State defeated Pitt 14-0 in the first meeting between the two football programs. The game was played at Forbes Field in Pittsburgh, and marked the beginning of a longstanding rivalry between the two schools.