We often wonder when it's necessary to discard a particular leftover. Back in college it was an easy choice; as soon as the food item began to lobby for its civil rights, we knew it probably wasn't wise to eat it. Now our fridge gets cleaned out a bit more often, and this dilemma was solved by rule of nose.
No longer. Our friends at StillTasty have compiled a database of the shelf lives of various food items. Very useful.