Soft Schools
Soft Schools: Biodiversity Quiz (Ecological Problems)
Take an interactive quiz over ecological problems affecting the environment. After completing the quiz, check your score, and then revisit any incorrect question for further review.
Khan Academy
Khan Academy: Science: Health and Medicine
We have some from here but I can't tell how many as they may have video embed codes. I did find some we don't have, as well as some we do have among the embedded videos. There is also a Youtube channel at...
PBS
Pbs Learning Media: La'ona De Wilde: Environmental Biologist
In this video profile produced for Teachers' Domain, meet La'ona DeWilde, an environmental biologist who integrates her Athabascan heritage and her Western scientific training to help remote Alaskan villages address environmental issues.
Library of Congress
Loc: Everyday Mysteries: What Is the Strongest Muscle?
There are a variety of ways one can look at what might be the strongest muscle in the body. This site defines the various types of muscles and goes on to explain which would be considered the strongest.