Scientists at Duke have taught monkeys with special brain implants how to control a robotic arm using just their minds. Which is kinda freaky when you think about it, though obviously this research could have some very positive benefits down the line:
The technology could someday allow people with paralyzing spinal cord injuries to operate machines or tools with their thoughts as naturally as others today do with their hands. It might even allow some paralyzed people to move their own arms or legs again, by transmitting the brain's directions not to a machine but directly to the muscles in those latent limbs. The brain implants could also allow scientists or soldiers to control, hands-free, small robots that could perform tasks in inhospitable environments or in war zones.