Awesome blog called the "Kitchen Pantry Scientist", she has tons of great science experiments that kids can do! Here is a Homemade science lab.
50 Brain Facts Every Educator Should Know
How to make an egg shell disappear without touching it. Lots of fun science experiments on this website, along with explanations for the kiddos.
Next winter, if your area is below 32°, go outside and blow "ice bubbles" The kids will never forget it!!