1. In 1836, the city of Chicago was incorporated as a town. At the time, the town only had a population of around 4,000 people. Today, Chicago is the third largest city in the United States with a population of over 2.7 million people.

2. On July 30, 1966, the Chicago Black Panther Party was formed. The Black Panthers were a political organization that aimed to address police brutality, poverty, and racial inequality. They gained national attention for their militant tactics and activism.

3. In 1995, Illinois Governor Jim Edgar signed a bill that required all new cars sold in the state to have airbags installed. This law made Illinois the first state in the country to require airbags in all new cars.

4. On July 30, 1898, the city of Aurora was hit by a tornado that killed 38 people and caused extensive damage. This tornado was part of a larger outbreak of severe weather that affected the Midwest region of the United States.

5. The 1932 Summer Olympics were held in Los Angeles, but the men's marathon was run in Chicago on July 30. The course was a loop that started and finished in Soldier Field, and was won by Juan Carlos Zabala of Argentina.