Do you know how to tell the difference between hard boiled eggs and raw eggs without cracking them open? A common method for determining the difference is spinning the eggs on a table. If you do this, you will notice that the hard boiled egg will spin faster and then raw egg will slowly wobble around. This can be explained by simple physics. In a raw egg, their are different substances inside that each have a different inertia. Thus when a torque is applied to the egg, the substances rotate at different speeds resulting in a wobbling motion more than a spinning one. When you spin the hard boiled egg, it spins as one solid unit, thus the hard boiled egg has more inertia and spins easily and longer. Here is an eggcellent video demonstrating this.