Artificial Skin for Prosthetic Limbs Can Sense a Grain of Salt

Prosthetic limbs may one day have "skin" with working nerve endings, letting patients feel with their artificial limbs just like they would with a real one. One of the many challenges of adjusting to life with a prosthetic limb is that the new limb lacks sensation; patients can't feel where their artificial limb is in space, or what it's touching, so they have to work mostly by sight. Adding a sense of touch could make controlling prosthetic limbs easier and more natural - but that's a ch