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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Blending inheritance formed the basis of nineteenth-century critiques of evolution by natural select
Medicinal leeches on a patient’s neck. Today leeches are sometimes used in microsurgery to prevent b
In 1891 William Dean Howells championed the poetry of Emily Dickinson: “This poetry is as characteri
Diagram of a section of a 15th-century oil painting
The Last Century Trends