Free Text Books

A week and a half ago the governor of the state of California announced the conclusion of Phase I of a program to evaluate "Free Digital Textbooks". Organizations who produce textbooks submitted a total of 16 manuscripts for review by the board of education. Ten of these met 90% of the standards required for acceptance as a sanctioned textbook for student use and four met 100% of the standards for the subjects they covered.

• CK-12 Foundation’s CK-12 Single Variable Calculus
  
• CK-12 Trigonometry
  
• CK-12 Chemistry
  
• Dr. H. Jerome Keisler’s Elementary Calculus: An Infinitesimal Approach

Of these, 3 out of 4 come from ck12.org which is run by the not-for-profit organization called the CK-12 Foundation.

I say, a BIG KUDOS to the fine men and women at CK-12 for the fine job they've done developing educational material which will have huge benefits for educators and children throughout the country. Keep up the good work!