I immediately sent this to my tetraplegic brother in-law. He cannot move his fingers so he uses a special device to precisely point on a touchscreen using his f

I immediately sent this to my tetraplegic brother in-law. He cannot move his fingers so he uses a special device to precisely point on a touchscreen using his fist. It makes sense to me: other than the fingers, the tongue is probably the most precise output device on the body.