There's nothing I find more irritating than opening a bag of chips and finding it nearly as empty as my stomach. I was convinced that companies like Frito Lay were ripping us off, until I dug a bit deeper. As it turns out, the extra space serves a purpose. It acts as a cushion that prevents chips from breaking while being shelved in grocery stores or delivered to grocery stores. What's interesting is that, contrary to popular belief, the air puffing up those bags isn't oxygen -- it's nitrogen. Unlike the former, which makes the chips spoil and oil go rancid, nitrogen helps the snacks remain fresh. Studies show that roughly 80 percent of the air we breathe is made up of nitrogen, so consumers need not worry of any health risks. The Fair Packaging and Label Act (1966) requires manufacturers to indicate the net weight of their products' contents. However, it seems the regulations are seldom enforced. Human beings are notoriously inept at perceiving size. Even...