 If the term negligible senescence doesn't ring a bell, it's basically another way to say rejuvenation or life extension. The negligible senescence scenarios or neg-sense all assume that rejuvenation therapies were already available in 2020 and would be phased in uniformly across the world over the course of 20 years. During this time the researchers assumed that mortality by nearly all causes, including the chronic diseases of aging, would be driven down almost to zero. So what did their models say?