Throughout history, humans have faced the inexorable process of aging and death. We’ve dreamt up countless myths to explain why we age and what comes of seeking immortality, but what does science tell us about the process? Why do we age? What purpose does it serve in natural selection? Indeed, what can science offer us in the way of eternal youth? Robert Lamb and Joe McCormick seek to find out in this two-part Stuff to Blow Your Mind exploration. (Originally published Jan. 9, 2018)