Google is working on an especially uncertain and distant shot. It is launching Calico, a new company that will focus on health and aging in particular. The independent firm will be run by Arthur Levinson, former CEO of biotech pioneer Genentech, who will also be an investor. Levinson, who began his career as a scientist and has a Ph.D. in biochemistry, plans to remain in his current roles as the chairman of the board of directors for both Genentech and Apple, a position he took over after its co-founder Steve Jobs died in 2011. In other words, the company behind YouTube and Google+ is gearing up to seriously attempt to extend the human life span.