Ever wonder how humans with normal hearing are able to "hear" what one person is saying in a crowded room where many people are talking? How is it that the ear is able to tune in and out of conversations going around, especially when everybody in a room is talking equally loud? To understand this ear "tuning" ability, one needs to first understand that the ear incorporates two "aspects" that allow for good hearing: a volume knob and an antenna. Should the volum…