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For decades, the residents of Fifty-Six, Arkansas, were captivated by a geological puzzle. They knew that the water flowing from Blanchard Spring originated a mile away within the Blanchard Springs Caverns, but a simple test in the 1950s—tossing corn husks into the...

Stalagmites are more than just pretty cave formations; they are ancient time-travelers. Scientists have figured out how to use the "radioactive clocks" hidden inside them to determine exactly how old they are and how the environment has changed over hundreds of...