1. In 1869, the Union Pacific Railroad was completed in Nebraska on May 10, marking the first transcontinental railroad in the United States. The completion of the railroad connected the East and the West coasts of the country and played a significant role in the growth of Nebraska's economy.

2. May 10, 1934, marks the day that Omaha's Memorial Stadium was opened. The stadium has since become an iconic landmark and has hosted several significant events, such as college football games, track and field events, and concerts.

3. On May 10, 1935, Omaha native Carl Curtis was inaugurated into the United States House of Representatives. Curtis served Nebraska in Congress for more than 30 years and played a crucial role in the formulation of important policies such as Social Security, Medicare, and Medicaid.

4. In 1975, on May 10, an F4 tornado struck the small town of Spencer located in central Nebraska. The tornado was estimated to be one of the deadliest in Nebraska's history, killing six people, injuring more than 50, and causing extensive damage to the town.

5. May 10, 2013, marked the opening of the world-famous Henry Doorly Zoo's new African Grasslands exhibit. The exhibit features a range of African animals, including giraffes, lions, cheetahs, and rhinoceroses, and is considered one of the best and largest displays of African wildlife in the world.