1. On December 17, 1903, Orville and Wilbur Wright made their historic first flight in Kitty Hawk, North Carolina. Though this event did not take place in Arizona, it marked a major milestone in the history of aviation that would ultimately have far-reaching implications for the state.

2. December 17 is also the anniversary of the founding of Yuma, Arizona, in 1854. Located in the southwestern part of the state near the Arizona-California border, Yuma has played an important role in the history of Arizona as a major transportation hub and military outpost.

3. In 1900, the Arizona Daily Star newspaper was first published in Tucson on December 17, and continues to be published today. The paper covers a wide range of local and national news, as well as sports, entertainment, and lifestyle content.

4. On December 17, 2007, Boeing successfully test-fired a missile from its new facility in Mesa, Arizona. The missile was part of the Joint Direct Attack Munition (JDAM) system, which enables precision-guided attack capabilities for military aircraft.

5. In 1973, Arizona became the first state in the nation to enact a law protecting the vulnerable adult population from abuse, neglect, and exploitation. The Adult Protective Services Act, which was signed into law on December 17 of that year, established procedures for investigating and reporting incidents of abuse and neglect. Today, Arizona's Adult Protective Services agency works to protect vulnerable adults and ensure their safety and well-being.