The easiest way to tell if an egg is fresh is to submerge it in a bowl of at least 4 inches of water. The freshest eggs will sink straight to the bottom and lie on their sides. The older the eggs are, the more they will lean towards floating upwards due to the expanding air pocket within them. An egg that sinks to the bottom but sits vertically on its tip in the water is still ok to eat, but if it floats then it has gone bad and should be thrown away.