One of the all-time BIGGEST GROANS (of delight) will come when you show your students how to separate an Egg using Peter Petrie!
How in the WORLD does this tie into any content area? Hmm, let's think: The shell is a SOLID, the EGG is a liquid--if you COOK the egg it turns to a SOLID. Can an egg ever turn into a GAS? *Don't look at me for the answer, find out for yourself.