ReadWorks

ReadWorks is a nonprofit that provides K-12 teachers with the largest, highest-quality library of curated nonfiction and literary articles in the country, along with reading comprehension and vocabulary supports, formative assessments, teacher guidance, and more. 

Everything ReadWorks does is based on proven cognitive science research, not unproven academic theory. 

(Source ReadWorks)

https://www.readworks.org/

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