I've done pretty good this week and posted a favorite science website every day. I'm thinking that the Friday post will carry through the weekend. Look for daily science favorite websites to be posted on weekdays only.
With that said... my favorite site to share today is EDHEADS. This is a fabulous site where students can build Rube Goldberg machines, predict the weather, and even perform a virtual hip replacement. You simply must check this out if you have a SMARTboard in your classroom. My students just love using this website with our SMARTboard.