Panels of artwork engraved by Native Americans between 1,000 and 400 years ago have been found deep within a cave now known as Unnamed Cave 11. More than 100 such caves have been discovered in the ...
A tree stump from an ancient submerged forest that is at least 6,000 years old protrudes from a beach at low tide at Pett Level in Sussex, England. (M.J. Thomas) (Ken Feisel) Experts from the British ...
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