Here are the instructions.
Materials: 2 eggs, 2 glasses filled 3/4s with water, lots of salt and a spoon.
Nikki first stirs the salt in one of the glasses.
Then, he carefully drops one of the eggs into the glass with tap water.
Mommy: "What happened, Nikki?"
Nikki: "It sank!"
"Wow! The other egg floated in the salt water!"
Nikki draws his findings. =D
