Multiple Subjects

https://ell.brainpop.com/

https://www.ixl.com/

https://allinonehighschool.com/

https://thecrashcourse.com/

https://www.census.gov/programs-surveys/sis/activities/grades-9-12.Grades_9-12.html

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Physics

http://fearofphysics.com/Videos/

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Biology

https://guesthollow.com/biology/

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Forensic Science

http://bsapp.com/forensics_illustrated/index.html

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Math

https://openstax.org/subjects/math

https://www.ck12.org/student/

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Social Science

https://openstax.org/subjects/social-sciences

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Humanities

https://openstax.org/subjects/humanities

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Multiple Science Subjects

https://openstax.org/subjects/science