1. On December 10, 1799, George Washington died at his home in Mount Vernon, Virginia. He was the first president of the United States and played a significant role in the American Revolution.

2. In 1836, Washington formally established the United States Patent Office. The patent office is responsible for granting patents to inventors and protecting their intellectual property rights.

3. December 10, 1898 saw the establishment of the Washington State Board of Health, which oversees public health initiatives and disease control efforts for the state.

4. In 1987, the Washington State Department of Transportation opened the second longest floating bridge in the world, the Lacey V. Murrow Memorial Bridge, which spans Lake Washington between Seattle and Mercer Island.

5. On December 10, 1989, Seattle's historic Pike Place Market was added to the National Register of Historic Places. The market, built in 1907, is known for its fresh produce, artisanal foods, and iconic fish throwing demonstration.