What's in an egg?

I haven't written about food much here, but it definitely figures into my environmental aspirations. We eat organic food whenever we can, and we also are huge fans of our local farmers market and the individual vendors that grow and sell fruits and vegetables and livestock in our general area. In an ideal world all of our food would come from our own garden or from the farms and gardens of our neighbors, but we don't even have a garden and neither do our immediate neighbors, so our local farmers market -- supplemented by our local grocery store -- has to suffice. 

One item we try to buy at the farmers market but often arrive too late to get are eggs (there's a lot of competition for them in our town!). So we buy them from the grocery store, and although the ones we typically buy aren't labeled organic, they claim to be from vegetarian-fed chickens that were not given artificial hormones or antibiotics. Some others claim to be "natural," "all-natural," "cage-free," and "naturally raised." Huh?!? Thankfully, I saw yesterday's NY Times article Sorting Through the Claims of the Boastful Egg that explains what all those similar-sounding terms mean.