Can we stave off the aging process by transfusing young blood into old people? The idea that youthful blood might have rejuvenating properties has lingered in popular imagination for centuries. In this episode of humanOS Radio, Dan speaks with Drs. Michael and Irina Conboy of the Department of Engineering at UC Berkeley. Their lab investigates the process of tissue repair throughout the body, and is trying to determine why damaged tissue is not productively repaired as the body ages.