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Biography
Addison, Thomas (1793–1860)
Biography
Adler, Alfred (1870–1937)
Biography
Adrian, Edgar Douglas (1889–1977)
Biography
Aiken, Howard Hathaway (1900–1973)
Biography
Aleksandrov, Pavel Sergeevich (1896–1982)
Biography
Alexander, Hattie Elizabeth (1901–1968)
Biography
Amsler-Laffon, Jakob (1823–1912)
Article
Anthropocene extinction
An ongoing current event in which a large number of living species are threatened with extinction or are going extinct because of environmentally destructive human activities. The Earth is presently in the midst of a mass extinction event. In the…
Biography
