 One of the big things was the invention of artificial incubation. It was just slightly off because we used hard-boiled eggs that are not hatched now. The chicken problem is that you can eat lots of eggs, but the chicken can't. The chickens just have a tendency to die from disease, which spreads very quickly. So people just couldn't eat lots of chickens. When you could do this with a great deal of energy, the farm people actually discovered that they had the best nutrition.