Most mercury that enters waterways originates from industrial pollution and other human activities, but it can also come from natural sources.

Researchers say: "Daphnia is a tiny crustacean the size of a grain of rice and are often-overlooked. Yet they are super abundant and can revolutionize the way we assess and mitigate chemical pollution sustainably."

The beach at Leddy Park in Burlington, Vermont, is open to the public again after a styrene spill forced officials to close the area for cleanup three weeks ago. 

The bipartisan state budget Gov. Gretchen Whitmer signed July 20 includes a down payment on a solution to one of Michigan’s biggest environmental remediation challenges.