Fossilized Dinosaur Eggs

Materials Needed:
Eggs (2 hard-boiled)
Vinegar (enough to fill one plastic cup after egg has been put in cup)
Cup (2 clear plastic ones)
Water

What to Do:
Place one egg in each of the cups.
Pour enough vinegar into one of the egg cups to completely cover the egg.
Pour enough water in the other egg cup to completely cover the egg.
Ask the children what they think will happen to the eggs.
Soak the eggs for 48 hours.  Make sure the children get to view the eggs several times throughout the 2 days (you may want to document their observations).
After they have been soaking for a couple of days, put the egg that was soaking in vinegar into a bowl of water and gently remove the foamy residue (calcium).
Let the egg dry for several days.
You should notice a wrinkled egg that resembles a fossilized egg!