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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Wang Guochen, c. nineteenth century
Wilbur Wright glides at Kitty Hawk, 1903, ushering in a century where airplanes would become the ...
Apollo Belvedere (detail), Roman copy after a 4th-century BCE Greek original.
Access to clean drinking water is just as important as adequate nutrition for human health
Introduction to Disease Resistance