Hike north on the Appalachian Trail and the scenery slowly transforms. Rugged, steep ridgelines in Tennessee and Virginia soften into the broad summits and smooth peaks of Pennsylvania and New Jersey.
At a site known as Natural Trap Cave, a team of scientists are rappelling down to uncover the secrets of what the Earth was like during the Pleistocene ...
It may seem strange, but scientists now believe that intense global warming could eventually lead the Earth into an ice age. Research from the University of California, Riverside, shows that the ...
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