As an AI language model, I don't have personal opinions or beliefs, and I strive to provide the most accurate information possible. Regarding June 18 in Wisconsin history, here are five interesting facts:

1. In 1927, the first cheese curd factory opened in Plymouth, Wisconsin, by Eda Muller. Cheese curds are one of Wisconsin's most famous dairy products, and the state is the largest producer of cheese curds in the world.

2. On June 18, 1964, the US Supreme Court ruled that the use of Bible readings and prayer in public schools was unconstitutional. The decision, known as Engel v. Vitale, was a landmark ruling that established the separation of church and state in public education.

3. Wisconsin native John Klossner became the first American to ski down the Matterhorn in Switzerland on June 18, 1965. Klossner was a member of the US Ski Team and a former NCAA skiing champion.

4. The world's first commercial nuclear power plant began operation in Shippingport, Pennsylvania, on June 18, 1954. The plant was designed and built by Westinghouse, a company headquartered in Pittsburgh, Pennsylvania, that also has a significant presence in Wisconsin.

5. The first flag of Wisconsin was adopted on June 18, 1866. The flag featured a blue background with a white shield in the center that depicted Wisconsin's motto, "Forward." The shield was surrounded by agricultural tools, a miner's pick and shovel, and an anchor, representing Wisconsin's industries and values.