1. The deadliest tornado in Colorado history occurred on May 12, 1927, in the town of Sand Creek. The tornado killed 15 people and injured more than 100 others, and it remains the deadliest tornado in the state's history.

2. On May 12, 1883, the Colorado state legislature approved the establishment of the Colorado School of Mines in Golden. The school was founded to teach mining engineering and has since expanded to include programs in other engineering fields, as well as applied science and mathematics.

3. The first recorded ascent of Longs Peak, the highest peak in Rocky Mountain National Park, was made on May 12, 1868, by John Wesley Powell and a group of climbers. The peak is a popular destination for hikers and climbers, and it is named after Stephen Long, an early explorer of the American West.

4. On May 12, 1989, the Colorado Rockies played their first game at Mile High Stadium in Denver. The team joined Major League Baseball as an expansion team and played at Mile High Stadium until the construction of Coors Field in 1995.

5. May 12, 1900, marked the opening of the Broadmoor Casino in Colorado Springs. The casino was a popular destination for wealthy visitors to the area and featured a ballroom, restaurants, and various forms of entertainment. The building now serves as part of the Broadmoor resort.