Does the 5-second rule apply to small clumps of dirt or dead bugs?
What they neglect to mention is that he may begin to grab up small pieces (and not necessarily pieces of food) from the floor, and proceed to put them in his mouth.
On an unrelated note, ack. Just ack. This article about clingy parents and their college-bound kids made me cringe. When I was in college, our dads called once a week (usually on Saturday morning at sevenfreakingthirty). Email was mostly for college kids back in those days, but I emailed my mom occasionally at her work. I still remember my first long weekend as a freshman. It must've been Labor Day weekend, and I was stunned at how dead the campus was as all the in-staters went home for the whole three days! I remember thinking, "These people JUST left home!"