Global fertility is declining so fast that, at current linear trends, global population would stabilize in this century at 9 or 10 billion. Progress in agriculture, energy and manufacturing technologies will hopefully make it possible to support these numbers in an increasingly ecologically sustainable way. But accelerating progress in the treatment of disease and slowing of aging will also be pressing down mortality rates, keeping unsustainable population growth a threat. Some have suggested that draconian controls on fertility would be an acceptable trade-off for the benefits of longer lives. This short story by Daniel Hero suggests another possible adaptation to the longevity-population dilemma. - J.