Students read about the process of hair growth beginning with the joining together of amino acids.

In this screencast, learners examine the properties of the hydrogen bond and how the bond changes when hair is shampooed or styled.

In this animated lesson, learners read about the disulfide bond, the second strongest chemical bond in the hair. This bond can only be altered by chemicals.

In this animated object, learners examine how changes in pH affect the salt bonds in strands of hair.

In this screencast, learners examine the properties of the peptide bond and how the bond relates to the structure of hair.

Learners examine the structure and function of skin including the production of melanin.

In this screencast, students view a basic wheelchair and identify its parts.