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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Milking reindeer in the 19th century
Monstrous people from distant lands depicted in a fifteenth-century European woodcut.
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b
Wang Guochen, c. nineteenth century
Wilbur Wright glides at Kitty Hawk, 1903, ushering in a century where airplanes would become the ...