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Muskox populations remain in the Arctic all year, though they migrate to higher elevations in the wi
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.
This portrait of Thomas Jefferson is considered an accurate likeness, painted when he was thirty-sev
On March 25, 1911, as scores of young factory girls leaped to their deaths from the eighth, ninth, a