Last April, an excited crowd gathered at a compound in Berkeley, California, for a three-day event called the Vitalist Bay Summit. One of the main goals, though, was to spread the word of Vitalism, a somewhat radical movement established by Nathan Cheng and his colleague Adam Gries a few years ago. Consider it longevity for the most hardcore adherents—a sweeping mission to which nothing short of total devotion will do. Although interest in longevity has certainly taken off in recent years, not everyone in the broader longevity space shares Vitalists’ commitment to actually making death obsolete. —Jessica HamzelouThis is the latest in our Big Story series, the home for MIT Technology Review’s most important, ambitious reporting.