Severed Arm

Surgeons prepare an amputation site for limb ­regeneration by cleaning the wound site of debris. They then expose raw nerves, bones, ­tendons, muscles, and other tissues so the molecules in them can be treated with a faint electrical charge

Biodome

To conduct electrical currents, the wound site must remain moist and protected from air, which would dry it out and expose the wound to infection. So surgeons put this sleeve over the site. Made of silicone, rubber, and silk, it mimics the aquatic habitat of a womb.