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.

The hills of South Moravia have yielded thousands of Stone Age artifacts over decades of excavation, most of them anonymous ...

Over 2.4 billion years ago, Earth entered one of the most extreme climate events in its history — the Huronian Glaciation. For up to 300 million years, vast ice sheets covered the planet in what may ...

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Hundreds of millions of Americans are presently besieged by a massive arctic blast and winter storm. Luckily for them, it will only be temporary. That wasn't the case 20,000 years ago... Between ...

Last fall, during the opening of the United Nations in New York City, I recognized the face of a federal officer from his ...

Over this time, wolves have had to endure numerous changes in the planet’s climate. The cycles of the Ice Ages repeatedly changed their habitat and available prey, providing an insight into how modern ...