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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
A sidewheeler on the Mississippi. In 1856 Samuel Clemens became an apprentice to a steamboat pilot a
Average Global Temperature Rise over the Past Century
The Death of Socrates by Jacques Louis David. The eighteenth-century French painter David portrayed ...
17th Century Physician Examining a Urine Specimen