"We put all the eggs into an incubator. After seven days, we hold each egg up to a candle or other bright light source. A fertilized egg will have a dark dot inside -- that's the embryo. The unfertilized eggs don't have the dark spot."

Eddie says, "It took me a bit to get used to, since in the U.S. all eggs are washed and need refrigerating. But if you don't wash a chicken egg, it keeps the 'cuticle' on the shell. And the cuticle keeps bacteria out."