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2. McGuffey Readers - Wikipedia

   en.wikipedia.org/wiki/McGuffey_Readers

   Cover of McGuffey's First Reader. The Eclectic Readers (commonly, but informally known as the McGuffey Readers) were a series of graded primers for grade levels 1–6. They were widely used as textbooks in American schools from the mid-19th century to the early 20th century, and are still used today in some private schools and homeschooling.

3. OpenStax - Wikipedia

   en.wikipedia.org/wiki/Openstax

   OpenStax textbooks follow a traditional peer review process aimed at ensuring they meet a high quality standard before publication. Textbooks are developed and peer-reviewed by educators in an attempt to ensure they are readable and accurate, meet the scope and sequence requirements of each course, are supported by instructor ancillaries, and are available with the latest technology-based ...

4. Sixth grade - Wikipedia

   en.wikipedia.org/wiki/Sixth_grade

   Sixth grade (also 6th grade or grade 6) is the sixth year of formal or compulsory education. Students in sixth grade are usually 12-13 years old. Students in sixth grade are usually 12-13 years old. It is commonly the first or second grade of middle school or the last grade of elementary school, and the sixth school year since kindergarten .

5. Chemistry - Wikipedia

   en.wikipedia.org/wiki/Chemistry

   Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

6. Matter - Wikipedia

   en.wikipedia.org/wiki/Matter

   A definition of "matter" based on its physical and chemical structure is: matter is made up of atoms. [17] Such atomic matter is also sometimes termed ordinary matter. As an example, deoxyribonucleic acid molecules (DNA) are matter under this definition because they are made of atoms.

7. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.