1. California became the 31st state on May 9, 1850: After gold was discovered in California in 1848, the population grew rapidly, and it became a state just two years later.

2. The San Francisco Fire Department was established on May 9, 1866: After a massive fire in 1851 destroyed much of San Francisco, the city recognized the need for a professional fire department. The department now serves the entire city and responds to more than 100,000 emergencies each year.

3. M.L. "Matt" Heron, known as "the Father of the Tehachapi Loop," was born on May 9, 1879: Heron was a civil engineer who designed the famous railroad loop in Tehachapi, California, which allowed trains to climb steep mountain grades with less effort.

4. The Santa Clara Valley Transportation Authority (VTA) was established on May 9, 1972: The VTA is responsible for public transportation in the Silicon Valley area, including buses, light rail, and paratransit services.

5. The first In-N-Out Burger restaurant opened in Baldwin Park, California, on May 9, 1948: The fast-food chain, known for its fresh ingredients and simple yet delicious menu, has since expanded to over 350 locations in six states.