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

The combination of corn sweat, the exhalation of water vapor through leaves, and a heat dome is bringing dangerously hot conditions to millions of people.

As temperatures heat up across the Midwest, a phenomenon known as ‘corn sweat’ can make the heat feel even worse. Through a process called evapotranspiration, the leaves of the plant release moisture back into the atmosphere.