After 1,000 generations' worth of experiments, the researchers found the final populations had some combinations of, let's say, Eaters and Lovers. Eaters never waited for a mate to arrive. They would always choose to recharge themselves unless they saw another robot face (Well, if he's right there waiting for me…). Lovers would sometimes wait for mates, depending on the situation. The experiments resulted in some populations composed predominantly of Eaters and some predominantly Lovers. Among the fittest populations, however, were those with a three-to-one ratio of Lovers to Eaters. One fit population even had sub-categories of Lovers, with some more strongly inclined to mate than others.