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Online encyclopedia and dictionary for the sciences. Includes biographies, images and animations, and videos.
Good place for layperson level of background for a variety of topics, from a wide variety of sources. Also includes medical encyclopedia and medical dictionary.
Oxford Reference Online
Oxford Reference includes dictionaries, including authoritative dictionaries for many languages, encyclopedias, and companions, featuring more in-depth but still brief entries, e.g. Oxford Companion to Classical Civilization.
Formerly Encyclopedia of Life Sciences, this resource from Wiley contains over 5000 peer-reviewed articles. Monthly-updating.