This was a very simple science project/craft and little ones would be capable of doing it, too...but you'd definitely want to see about the boiling water parts yourself!
First, gather all of your ingredients. You'll need some Borax, a pot of water, a few mason jars or mayonnaise jars, pencils, pipe cleaners and string or wire. Please ignore the fact that my mason jar is crusted up with crystals on the bottom already. We made crystals last night and they're kind of hard to rinse out of the jar.