Their web site has lots of science experiments. All you need to do is figure out how to apply an experiment to whatever Chritian concept you are trying to teach.
http://www.exploratorium.edu/snacks/
Note: these aren't food experiments, as they explain it
quote:
These pages are full of Snacks...but they're not the kind you eat. They're the kind you can learn from and have fun with. Exploratorium Science Snacks are miniature versions of some of the most popular exhibits at the Exploratorium.