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Woke up today with the realization that I couldn't feel my left arm. That is, at all. I could move my shoulder, but the rest of it just dangled like a dead weight; my fingers not only couldn't be felt, but they completely refused to respond to my attempts to move them; and when I touched my left arm with my right hand, it felt like I was touching a foreign object made of some strange material. This experience was, let's just say, not very pleasant.