We don't eat a lot of eggs in our house since Charissa and I don't really care for them. That means that a dozen eggs can sit in our refrigerator for a long time. So how do you know if an egg is still good? It's not like it goes brown around the edges or gets soft. The way to tell if an egg has gone bad is to see if it floats in water. Isn't that cool? Just put the eggs in a large bowl of water and see if they sink or swim. The swimmers get tossed.
Simple, but helpful. :)