Naked Eggs and Dancing Raisins

Fun with bubbles two different ways!  
An egg has a great shell made of mostly calcium.  Distilled white vinegar is a slightly smelly acid.  What happens when you put an egg in a cup of vinegar?  After about 3 days you get a giant naked egg. But before it goes naked you can immediately see bubbles form on the shell. Will the egg float?  Will it feel slimy?  What would it taste like?  Try a pickled egg from the grocer to find out.  Why does this work? Calcium does this cool thing of making bubbles (releasing a gas) when mixed with an acid and slowly disappearing (a chemical reaction).  If you feel like more experiments with the now rubbery egg you can shrink it by putting it in a sweet bath of light corn syrup.  The egg's membrane allows things to go in and come out given the right conditions. 
If watching your egg in the vinegar has made you thirsty, hungry and a little impatient then it is time for the dancing raisins. All you need are some raisins and a clear bubbly beverage. (Raisins go particularly well with 7up in my opinion). Pour your drink in a clear cup then drop the raisins in. Soon they will be floating up and down with the bubbles from your beverage.  You can taste this experiment or try some other things like peanuts and pasta. The raisins float but not because of a chemical reaction. The wrinkly surface catches the bubbles and when there are enough, up goes the raisin then when some bubbles pop down goes the raisin. 
Bon Appetit and Happy Experimenting!
PS One place to get more info on the Naked Egg is from the San Fransisco Exploratorium website.