Yvette, my 8 year old, did her Science Project on BONES and she wanted to go beyond just a model and add an experiment. She searched Google (with parental supervision) and found that an Egg is made up of the same things as bones. And she left the egg in vinegar (which we have plenty of) and it became soft and rubbery as well as translucent. After 24 hours later the egg was hard again.
Linking up with Beth @ Happily Domestic