Empty shelves where eggs should be at a Whole Foods Market in Washington, D.C. The store blames increased demand for organic eggs. Dan Charles/NPR hide caption

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Chickens That Lay Organic Eggs Eat Imported Food, And It's Pricey

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The white egg yolk at left, seen next to a yellow yolk, may seem strange, but it's just a result of the chicken feed used, scientists say. Junko Kimura/Getty Images hide caption

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Cage-free chickens in Harold Sensenig's barn near Hershey, Pa., get to roam and perch on steel rods, but they don't go outside. Dan Charles/NPR hide caption

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What The Rise Of Cage-Free Eggs Means For Chickens

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An image of researchers at Oregon Health & Science University removing the nucleus from the mother's cell before it's inserted into the donor's egg cell. Courtesty of Oregon Health & Science University hide caption

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Geneticists Breach Ethical Taboo By Changing Genes Across Generations

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A city worker sells eggs as people line up outside the truck in Mexico City on Aug. 24. The Mexican government is battling an egg shortage that has caused prices to spike in a country with the highest per-capita egg consumption on Earth. Alexandre Meneghini/AP hide caption

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It's No Yolk: Mexicans Cope With Egg Shortage, Price Spikes

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At the JS West egg farm, south of Modesto, Calif., one chicken house has the new, spacious cages that egg producers and animal welfare advocates say keep chickens happier. Big Dutchman hide caption

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How Two Bitter Adversaries Hatched A Plan To Change The Egg Business

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At the JS West egg farm, south of Modesto, Calif., one chicken house has the new, spacious cages that egg producers and animal welfare advocates say keep chickens happier. Big Dutchman hide caption

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Coop D'Etat: Farmers, Humane Society Partner On Chicken-Cage Revolution

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