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Mayfly swarms plague Milwaukee

Mayflies have begun emerging from the Mississippi River in swarms that show up on radar like thunderstorms, coat roads and leave behind slimy messes. They’ve already been blamed for at least one car crash this week in Wisconsin.

World is on a hot streak

The globe is on a hot streak, setting a heat record in June. That’s after the world broke a record in May. Last month’s average global temperature was 61.2 degrees, which is 1.3 degrees higher than the 20th century average.

Great white shark numbers are surging, says study

A report that scientists are calling one of the most comprehensive studies of great white sharks finds their numbers are surging in the ocean off the Eastern U.S. and Canada after decades of decline — bad news if you’re a seal, but something experts say shouldn’t instill fear in beachgoers this summer.