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Try these first:
Britannica School High
Encyclopedia articles, high school students more »Explora for High School
Research portal for high school students more »MAS Ultra (at EBSCOhost)
Articles, high school students more »
See also: Versión en EspañolNational Science Digital Library
science, technology, engineering, mathematics, websites, resources more »Science and Technology Collection
Scientific research, peer-reviewed more »