1. Wisconsin's Earth Day origins: On April 22, 1970, Wisconsin Senator Gaylord Nelson created the first Earth Day, a national event designed to raise public awareness of environmental issues. Today, Earth Day is celebrated in more than 190 countries worldwide.

2. John Muir's Birthday: April 22 marks the birthday of John Muir, the naturalist and founder of the Sierra Club. Muir's conservation efforts helped to establish national parks and wilderness areas in the United States.

3. Badger State Trivia: Wisconsin became known as the Badger State in the early 19th century. This was due to lead miners who were forced to live in mine tunnels and burrowed into hillsides to stay warm, much like badgers. Today, the badger is considered the state animal.

4. Prohibition in Wisconsin: On April 22, 1919, the Wisconsin state legislature voted to ratify the 18th amendment to the US Constitution, which prohibited the manufacture, sale, and transportation of alcohol. The state was one of the first to enact its own Prohibition laws.

5. Wisconsin's First Capitol: On April 22, 1837, the territorial legislature of Wisconsin convened for the first time in Belmont, making the town the first capital of Wisconsin. The capital was moved to Madison in 1838. Today, the Old Belmont Courthouse is a museum that offers a glimpse into Wisconsin's early history.