人类寿命的极限：我们能活多久？

Scientists are pursuing the limits of longevity BY VENKI RAMAKRISHNAN ILLUSTRATIONS BY ADA ZEJUN SHEN HUMANS MAY BE THE ONLY CREATURES THAT ARE aware of their mortality. There is no evidence that other animals know their time on Earth is finite. The realization that we and everyone we know will someday die must be one of the more unsettling discoveries of childhood. Ever since humans recognized we have a limited lifespan, that knowledge has shaped our cultures, religions and philosophies. Although we make plans, pursue careers and behave as though we will live indefinitely, the fear of death and the desire to transcend it remain. As a species, we have made some major strides against mortality. …