Could the four fingers be a simple mistake in the post-production process? Perhaps the missing finger was in the original image but was erased without Photoshopping the rest of the hand to compensate.

After two weeks, they were assigned to one of two laboratory groups, in which the robot exoskeleton hand passively moved those four fingers for 30 minutes to perform the chord trill—faster than ...

In fact, hand injuries are one of the leading types of injuries on the job in the United States. To keep your fingers, thumbs ... you are up-to-date on your biennial hand and pinch point safety ...