Free Digital Textbooks for K-12 

This site provides a large number of free online textbooks (if you start at, you can choose "student" or "teacher").  Some of the books under the category of Human Biology are 

  1. Disgestion and Nutrition
  2. Reproducion
  3. Sexuality
  4. Breathing
The ebook Biology 1 Honors includes an interesting chapter on the Immune System and Disease.

You may want to use some of these books now to help students who need remediation, or another version for a different wording of the explanation. Algebra and Geometry are available also in Spanish. Most of the books are in the sciences.  The books also contain activities for teachers.  

  • People's Physics Book Version 3 (with Videos), created by CK-12

    • This is intended to be used as one small part of a multifaceted strategy to teach physics conceptually and mathematically.
  • Human Biology, by Douglas Wilkin, Ph.D.  and Jean Brainard, Ph.D.  (scholarly, 274 pages) 
    • As mentioned, the books contain activities for teachers.  Here is part of one activity within the book Human Biology – Sexuality: 
      • Activity 2-1:  Scripts for Dating  


The thought of dating may either terrify you, excite you, or both. How do you ask for a date? How do you say yes or no? What would an ideal date be like? How do you deal with a bad date? In this activity you have a chance to role-play dating situations and practice what to say and how to say it.


  • One Activity Report per group
  • Props brought in by the group (optional)


  • Step 1:  Your teacher will divide you into group and give each group an Activity Report.
  • Step 2: As a group, discuss the questions.  Have one member act as a recorder to write down what you say, or rotate the job for each question.