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A toxic underground river of groundwater carrying mercury has been found seeping into Spain’s Mar Menor lagoon. This hidden flow sends roughly 2.2 pounds of mercury into the lagoon every year.

The work was led by Céline Lavergne, Ph.D., at the

From Earth, Saturn’s rings look like a razor – tens of thousands of kilometers wide yet only about 10 meters thick in the vertical direction. That knife-edge geometry is a big part of their drama.

But new evidence suggests the rings don’t…