Don't count your chickens until they are hatched

Since the first chicken hatched in the first barn (which was perhaps a cave or something), there have always been a problem with predicting how many chickens a given number of eggs will yield. Dirt, cold, foxes and thieves contributed to the loss: out of 10 original eggs one could have get just one chicken. And that sucked!
But now, after 10000 years of technological progress, there's a whole different meaning to the old saying. Water and air pollution, radiation and genetically modified food, plus, of course, warm and clean barns, sometimes produce 1.5, or 2, or 2.75 chickens out of each egg. And that's kinda cool!