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Biography
Alder, Kurt (1902–1958)
Biography
Aleksandrov, Pavel Sergeevich (1896–1982)
Article
Amine
A member of a group of organic compounds that can be considered as derived from ammonia by replacement of one or more hydrogens by organic functional groups. Generally amines are bases of widely varying strengths, but a few that are acidic are…
Biography
Amsler-Laffon, Jakob (1823–1912)
Biography
Andrews, Thomas (1813–1885)
Biography
Anning, Mary (1799–1847)
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
Apollonius of Perga (c. 245–c.190 BC)
Biography