Are eggs have been hard-boiled or uncooked?

Here’s an easy way to tell if the eggs in your fridge have been hard-boiled:

Simply give the egg a spin on a firm surface. If cooked, it will continue to spin; if not, it may make one or two wobbly turns and promptly stop.

The reason? The liquid inside an uncooked egg (as in a glass of water) will not pick up momentum. However, the solid inside of a cooked egg will (as would frozen water).