WHAT'S INSIDE: EARTH SCIENCE
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The Doll's Theater of Carlsbad Caverns looks otherworldly and took ages to form. What other incredible sights await us below ground?
We've been scribbling our thoughts down on stone and paper for a while now. But the job of assembling a history for all of humanity gets a lot harder once those written records disappear. Luckily, archaeologists are happy to tackle the job.