What is a soil crust and why do I care? This is amazing stuff for use in the classroom for an example of an ecosystem that thrives in the middle of a vapid area. Interesting for ecosystems.
Good site for introducing science to the classroom curriculum. Encourages teachers that are not comfortable with concepts try by giving science-lite queue cards.
Teach Tech Science! Though not a life or physical science comp is here to stay. This great resource for those techie kids in your class that you need keep up with!