You have a carton of eggs in the fridge that has gone past its sell-by date. All is not lost, as the printed date on the carton doesn’t actually correspond to the expiration date. Most store-bought eggs, if kept in the refrigerator, remain fresh for weeks beyond that date. Eating a bad egg can cause food poisoning, but before tossing in the garbage, here is an easy way to tell if it is still good: place the egg in a glass/bowl of cold water. If it floats to the top, it is rotten; if it stays at the bottom, it is still fresh and good to eat.