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Chrome extension to find and read journal articles for free.
BioMed Central (BMC)
Open access journals for chemistry, math, engineering, psychology, and more.
Wolfram Demonstrations Project
Illuminations by NCTM
Resources from the NCTM- National Council of Teachers of Mathematics (USA)
Bilingual subject glossaries
Bilingual glossaries for math, science, literature, social studies, and English language arts in English and multiple languages.
Steve Miller's Math Riddles
BASE (Bielefeld Academic Search Engine)
Pros and Cons
Comprehensive, nonpartisan resource navigates controversial issues