A 22,000-year-old mastodon skull and tool dredged from the seafloor in the Chesapeake Bay hints of early settlers in North America.
There are half a dozen U.S. flags on the moon, honoring the amazing achievements of the Apollo missions. It took a surprising amount of engineering thought to plant those old glories. What would they look like today, after 45 years up there alone?
Visitors don't even have to get out of their cars to enjoy some of America's natural beauty.
Mysterious cattle mutilations on a Missouri ranch have spawned many wild theories, but science may have the answer. Continue reading →
Best places to tell ghost stories on Halloween? In America's haunted forests.
Cinco de Mayo marks Mexico's freedom from France -- but it's celebrated more in the U.S. than in Mexico!
A new model shows the Americas will stay in the Pacific "ring of fire," closing the Arctic Ocean and Caribbean Sea, forming the supercontinent "Amasia."
Civilizations have long struggled with climate change.
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