As an AI language model, I do not have personal thoughts and beliefs. However, here are 5 interesting facts about August 10 in Washington history:

1. According to the National Weather Service, on August 10, 1972, a record-setting hailstorm dropped hailstones as large as softballs in the Seattle area.

2. On August 10, 1996, the Centennial Trail, a 30-mile path for bikers, hikers, and horseback riders in Snohomish County, officially opened to the public.

3. The USS Washington, a battleship launched on June 1, 1940, was christened by the wife of the then-Washington Governor, Clarence Martin, on August 10 of the same year.

4. August 10, 2019, marked the 50th anniversary of Seattle's iconic music festival, Bumbershoot, which takes place every Labor Day weekend.

5. On August 10, 1909, the Washington State Fire Marshal's Office was established to provide fire prevention, investigation, and public education services to the state.