http://www.world-mysteries.com/index_m.htm
World Mysteries.com
Cells Alive! (.com)
This is a great interactive site for anyone wanting to learn about cellular structure and function! Complete with interactive cell models, size models, puzzles, quizzes, and more!
Access Science.com
Online science encyclopedia- easily navigated and full of great information.
http://apod.nasa.gov/apod/archivepix.html
http://www.sciencedaily.com
http://www.kidsites.com/sites-edu/science.htm
http://www.highlightskids.com/Science/ScienceQuestions/h8scienceQuestionArchive.asp?qType=more
A list of science questions kids might be curious about.