Spread the Word Spread the Word Spread the Wordabout CK-12 Use these handy materials to inform your students, fellow teachers, and parents about CK-12 Share Tweet Introduction Video A quick, two-minute introduction to CK12.org and FlexBook® Textbooks.Share Facebook Google+ Twitter Email Download Handout One-page handout about CK-12.Share Facebook Google+ Twitter Email Download Learn How CK-12 Overview ×