1. In 1928, Nebraska became the first state to establish a unicameral legislature, meaning they only had one legislative body rather than the traditional two. This streamlined the legislative process and resulted in greater efficiency and lower costs.

2. On April 21, 1989, Nebraska Governor Kay Orr signed a bill that made Nebraska one of the first states to enact a comprehensive ban on smoking in public spaces. This included workplaces, restaurants, and bars.

3. In 1875, the first Arbor Day was celebrated in Nebraska, thanks to the efforts of journalist J. Sterling Morton. This holiday encourages people to plant trees and is now celebrated throughout the United States and in many other countries.

4. On April 21, 1918, the deadliest tornado in Nebraska history struck Omaha, killing 103 people and causing over $10 million in damages. The tornado was rated an F4 on the Fujita scale and traveled over 100 miles.

5. Nebraska native and legendary athlete Bob Boozer was born on April 21, 1937. Boozer played college basketball for Kansas State University and went on to have a successful NBA career, earning an NBA championship with the Milwaukee Bucks in 1970. He was inducted into the Nebraska Sports Hall of Fame in 2002.