I just rediscovered this site Science Myths in K-6 Textbooks which I find lots of interesting nuggets on. Like the fact that water IS blue, and the sky is blue because air is blue and also red depending on viewing angle. It reflects blue light but is red at sunset because it transmits red light.

This site always reminds me of the very old science textbook I had in elementary school in the 1980′s that said someday man will go to the moon.