Modern scientific techniques help scientists measure the age of ancient rocks such as these pegmatite with quartz and feldspar ones in Wyo...

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Modern scientific techniques help scientists measure the age of ancient rocks such as these pegmatite with quartz and feldspar ones in Wyo...
THORNBOROUGH henges In other places there can be a finer balance. The origins of a piece of oral history are typically much more obscure t...
Dresden Codex Where we have first-hand informants or can actually still witness long-standing cultural practices, we are in the strongest ...
The Nabataean kingdom was one of the wealthiest of the Client States which were a prominent feature on the Roman frontiers, especially in ...
Distinctive spearpoints made by the so-called Clovis culture have been found at sites throughout the contiguous United States, as well as ...
Etched into crops, the outlines of Bronze Age burial mounds surround a roughly 190-foot (57-meter) circular Stone Age temple site about 15...
The crop circles of Santa Teresinha, Brazil, are seen in an undated photograph. John Roach for National Geographic News January 4, 2010 Hund...