‘Frankenstein’ Parabiotic Mice Show that “Young Blood” Isn’t Just a Saying

Imagine you’re a mad scientist who wants to figure out if there’s something in young peoples’ blood that can be transplanted into old people (some “youth serum” that you could package and sell) to improve their health. You might go about it by harvesting vast quantities of blood from young people, and transfusing it (or different components of it) into old people; running tests on muscle tone, energy, and cognitive function to see if and what components reversed the aging process in old people. This experiment isn’t feasible in humans—it’s hard to find two people who have compatible blood...

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