Robotic arms are amazing in their ability to make incredibly precise movements, and work endlessly without getting fatigued. That's why they're used in assembling cars, delicate electronic components and, increasingly, surgery on human patients. Click here to see how precisely a robot arm can wield a samurai blade.
Using a surgical robot, a surgeon can often perform an operation faster, more precisely and with much smaller incisions into the body than doing it by hand. Some operations require such precision that using a robot is just about the only way to do them.
Another cool trick with surgical robots is remote access, so a specialist surgeon can perform an operation from anywhere in the world. Video chatting on Skype doesn't seem quite as impressive now, does it?
Of course, that remote access comes with a danger. Just like everything else, once you put something online, there's often a chance that some hacker will try to break into it.