Emma Catague was surprised to see eggs at the Costco in Tukwila. The egg shelves had been empty on her previous visit. She also noticed the new sign announcing a limit of three egg cartons ...

America is obsessed with egg prices, but do we really know why they're so important? Here's a taster: one 52-gram egg contains 74 kilocalories, 5.2 grams in fat (only 1.7 grams of which are saturated) ...