1. On January 13, 1931, the state of Nevada legalized gambling. This decision had a significant impact on the state's economy, as gambling became a major source of revenue for the state.

2. On January 13, 1940, actor Robert Stack was born in Los Angeles, California. Stack would later become known for his roles in films such as "The Untouchables" and "Airplane!"

3. On January 13, 1960, the first atomic reactor outside of the United States was activated at the National Reactor Testing Station (NRTS) in Idaho. The NRTS was a major center for nuclear research and development during the Cold War.

4. On January 13, 1992, the Nevada Test Site was closed to underground nuclear testing. The site had been used for over four decades to conduct nuclear weapons tests, and the decision to close it was seen as a victory for anti-nuclear activists.

5. On January 13, 2017, a snow storm hit the Las Vegas Valley, causing significant disruptions to transportation and other services. It was the first significant snowfall in the area in over a decade, and many residents were caught off guard by the storm.