This is actually a very fun experiment. Here is how you do it: First you take an egg and put in into a container,then you fill the container with vinegar (at least enough to cover the egg) and leave it alone for a week. After a week take the egg out and you will see the shell is gone because the vinegar caused it to dissolve. Now the egg should feel rubbery, go ahead and let it drop from about a foot high and it should bounce. If you go higher then 3 feet the egg might break so be careful.