What you need: One raw egg, and one hard boiled egg (these eggs are from our chickens - one shell is naturally light green! It's kinda hard to tell in the photos though), and a barrier if you are letting the kiddos take the eggs for a spin! (we used math blocks, but another idea would be to use rolled up dish towels - that way, if the raw egg breaks, you have quick cleanup!)
Spin the first egg, then stop it quickly and release your fingers/hand right away (stop-and-release -- quick, like a ninja). Then, do the same with the second egg. One of the eggs will continue to spin just a wee bit after you stopped it; that is the raw egg! The hard boiled egg will not continue to spin (if properly stopped). You might want to demonstrate first if you have small kids like mine.
Why? Because the raw egg has the yolk suspended in the clear liquid inside and there is also a very small pocket of air. When you spin the egg, the yolk and liquid spins inside the shell and when you stop it suddenly, the liquid inside of the egg is still in motion after you've stop it's container (Physics!)
You can demonstrate further by putting water in a glass and move the the glass in circles to make the water spin inside. Stop the glass suddenly and ask the kiddos what they observe!
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