Continuing westbound on Interstate 80 through northern Illinois, we crossed over the Mississippi River into Iowa at dusk. We counted on driving well into the night in order to make Nebraska fairly early the next day. The "World's Largest Truck Stop" drew us off the highway for a quick bite to eat, but there was a Truckers Jamboree going on, giving us a chance to see a large number of Iowans and find out whether they live up to their giant corn-fed stereotypes...
I grew up hearing tornado sirens periodically being tested and practicing tornado drills in school and summer camp. Our arrival in tornado country last summer announced itself by this familiar siren on our way across northern Illinois...A civil defense siren (also referred to as an air raid siren, tornado siren, tsunami siren, or other outdoor warning siren) is a mechanical or electronic device for generating sound to provide warning of approaching danger and sometimes to indicate when the danger has passed. Initially designed to warn of air raids in World War II, they were adapted to warn of nuclear attack and of natural phenomena such as tornadoes. In the United States, sirens are usually used to warn of impending natural disasters, as well as threats of military attacks, which in the United States are rare. Throughout the Great Plains, Midwest, and South, they are used to notify the public of a tornado warning or flash flood.
Great Plains scavenger hunt item number two: prairie potholePrairie potholes are depressional wetlands (primarily freshwater marshes) found most often in the Upper Midwest, especially North Dakota, South Dakota, Wisconsin, and Minnesota. This formerly glaciated landscape is pockmarked with an immense number of potholes, which fill with snowmelt and rain in the spring. Some prairie pothole marshes are temporary, while others may be essentially permanent. Here a pattern of rough concentric circles develops. Submerged and floating aquatic plants take over the deeper water in the middle of the pothole while bulrushes and cattails grow closer to shore. Wet, sedgy marshes lie next to the upland.
The Upper Midwest, because of its numerous shallow lakes and marshes, rich soils, and warm summers, is described as being one of the most important wetland regions in the world. The area is home to more than 50 percent of North American migratory waterfowl, with many species dependent on the potholes for breeding and feeding.
-U.S. Environmental Protection Agency
The tallgrass prairie is an ecosystem native to central North America, with fire as its primary periodic disturbance. In the past, tallgrass prairies covered a large portion of the American Midwest, just east of the Great Plains, and portions of the Canadian Prairies. They flourished in areas with rich loess soils and moderate rainfall of around 30 to 35 inches (760 to 890 mm) per year.
-Wikipedia
One of the last large untouched patches of prairie left in Illinois is preserved as a state park about 50 miles southwest of Chicago. Goose Lake Prairie State Natural Area contains a patchwork of old-growth tallgrass prairie (it was always too poorly drained to be useful to farmers or other development). As a result it's a refuge for rare prairie plants, moths, butterflies and other insects, and a great place for birding. 
Michigan's biting flies, buzzing lawn mowers, sand in toes, ice cream, fireworks, tourists, river-soaked shoes... this is how we knew our summer had begun. After down-shifting in Michigan for a week, it was time to get back on the highway again in order to see the Great Plains we'd set out to. 
The skies in northern Michigan are so far from city lights that even staring into a backyard fire for a couple of hours does not erase the brilliant Milky Way over head. One of my favorite things about traveling up there is the way our galaxy reveals itself beyond the usual smudge across the sky. Looking sideways into our galaxy's disc, there appears to be wisps of cotton floating above and below the whirling plane. The night we built this fire was chilly, so to boost the fire's effectiveness we opened the bottle of whiskey we'd bought at the duty free shop on our way through Canada.
The Crystal River empties Glen Lake into Lake Michigan just over a mile away. But, because of the slow, meandering course the river takes, there are about 15 miles of paddling via canoe or kayak to get to the village of Glen Arbor on Lake Michigan. A map of the river looks like the chart a seismograph makes in an earthquake, but the land surrounding the river is mostly flat, sandy cedar swamp that occasionally opens up for lush reed fields -apparently good habitat for huge snappers and strange bitterns. 
