Every now and then, as daylight wanes in May or June in Ohio, the dim glow of a porch light might play tricks on you. At the margins of the beam, it may appear that the grass is waving. You might figure it’s just the wind, and most years, you’d probably be right. But other years, 2021 included, the swaying will be caused by insects—scads of them. When the cicadas of Brood X emerge from the soil after 17 years underground, explains Gene Kritsky, a biologist at Mount St. Joseph…
