A newly discovered immune strategy protects bacteria and more advanced species, from corals to bees

Every time we make a call, send a text message or watch a video, some of the energy stored in the cell phone battery is depleted. Living cells also store energy in "currencies" they can cash in when needed, in order to fuel life processes. The main energy currency of all living things on Earth—the lithium battery that powers the living world, as it were—is a molecule known as ATP.