Tonight we did the "Magic Floating Egg" experiment.  It also had a hidden fractions lesson in it.  First we were to fill the bottom part of the pop bottle 1/4 with water.  First we eye-balled where half was and then eye-balled where 1/4 would be.  I think that this was the first time that he got that 1/4 is a half of a half.

Then we cracked an egg into the water and watched what happened. 

That's right.  It sunk straight to the bottom.

Then we did it again but made a very high concentrated salt water solution.


(This was almost as much fun to him as cracking the egg and seeing what happened)

Then we added an egg again and voila!


The egg floated to the top. 

We always enjoy doing experiments and we were able to discuss things like solution, dissolving, and density and got to do things like estimating, measuring and predicting.