(NEXSTAR) – Uh oh. You just dropped your toast on the floor. It was the last piece, too. And you were enjoying it so, so much. You know where this is going. Since childhood, most of us have been aware ...

According to the so-called five-second rule, eating food after it's dropped on the floor is safe—as long as you do so within the allotted timeframe. It's one of those "rules" that has stood the test ...