1. Do the float test
The simplest way to test an egg's freshness is to drop it in a glass—or bowl—of cold water and see what happens. If it sinks to the bottom and sits on its side, it's still fresh. If it sinks but sits on its end, it's less-fresh but still edible. If it floats, toss it out, it's officially bad. The reason this works is because an egg's shell is porous, and the liquid inside slowly evaporates over time, leaving a pocket of air large enough to make it buoyant.