A phenomenon called "corn sweats" could exacerbate the impacts of the extreme heat blanketing a large portion of the U.S., according to experts.

It’s not that corn sweats more than other plants — an acre releases less moisture on average than, say, a large oak tree — but the Midwest has a lot of corn in late July. In Iowa, for example, more than two-thirds of the area is farmland, and corn is the top crop (followed by soybeans, which, by the way, also sweat).