Self improvement:
Emergency medical supplies: your head gets cut off. The pack (spread throughout your skull) stabilizes your brain. Or you get massive bleeding: it shuts down blood supply to that area temporarily, improves clotting, and grows a bandage over the wound.
Wings: most useful in low-gravity habitats, or when skydiving.
Controllable fingertip suction cups (for picking up paper stuck to the desk).
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