Currently,most advanced prosthetic hands can't even thumbs-up or flip you the bird. They...

[Downey] Currently,
most advanced prosthetic hands can't even thumbs-up or flip you the bird. They can only open or grip, using all five fingers at once. Most of the prosthetics
that are available
on the market nowadays, um, actually use
EMG technology, which stands
for "electromyography," and essentially what it does
is there are two sensors that make contact
with my residual limb, and they pick up electrical
signals from the muscles