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In the study of longevity, researchers turned to a macabre and shocking experiment called parabiosis where two animals are sewn together. It turns out that if you connect an old mouse to a young mouse, the old mouse grows young again. Nobody likes animal research (and content warning, obviously, this will be gross but not explicit). But, for now, understanding biology means we need to study live animals. And this study revealed something important, even if it sounds like some weird vampire stuff. This essay is also available in YouTube form.