In the U.S., stroke is a major cause of long-term disability which affects 700,000 people annually. Most of them are over 65 years old and some have difficulties grasping objects after their stroke.

About 17 years ago, Keven Walgamott lost his left hand and part of his forearm in an electrical accident. Now, Walgamott can use his thoughts to tell the fingers of his bionic hand to pick up eggs and ...