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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
A reindeer sled, Arkhangelsk, Russia. Late nineteenth-century photochrom.
Behaviors that are suspicious for substance abuse
After excavation, recovered remains are screened to ensure that even tiny fragments are retrieved an
Apollo Belvedere (detail), Roman copy after a 4th-century BCE Greek original.
Ancient fossilized single-celled organisms