1. In 1880, a destructive tornado struck Roswell, New Mexico, destroying buildings and causing numerous fatalities. The tornado remains one of the deadliest natural disasters in the state's history.

2. April 20, 1902, marked the day that Carlsbad Cave was first discovered. The cave system is one of the largest in the world and features stunning stalactites and stalagmites.

3. In 1912, New Mexico became the 47th state in the United States. April 20 is now celebrated as New Mexico Statehood Day.

4. In 1970, the first Earth Day was celebrated in New Mexico and across the nation, marking the beginning of a new era of environmental activism and awareness.

5. On April 20, 2007, the University of New Mexico in Albuquerque hosted a groundbreaking energy conference focused on developing alternative sources of energy to replace traditional fossil fuels. The conference brought together experts from around the world to discuss innovative solutions to the energy crisis.