photo of flying batLongevity researchers are fascinated by bats, writes Rachel Tompa (@rachel_tompa), since these animals defy the typical correlation between an animal species’ body size and its life span. Tompa writes for the Allen Institute about a new molecular clock method that can tell how old individual bats are important information for conservation research — and reveals some possible reasons for why they live so long. Image: MathKnight via Wikimedia Commons