It's still not entirely clear why Neanderthals died out. They might have been simply absorbed through interbreeding. They might not have had sufficient numbers to compete for scarce resources. Or perhaps it had something to do with climate.
For all the high-fiving, grand envisioning and lavish investing in organizations like Google's Calico and Human Longevity -- which is building the world's largest DNA sequencing operation -- one fundamental question remains: What's the agenda?