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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.