I have good control over my limbs - most of the time at least! People with impaired movement or who have lost limbs are starting to find that hi-tech brain implants could help them.
But how do we decide what's safe when we meddle with the brain? As brain implant technology gets better and more people can use it, society needs to decide what kind of intervention is acceptable. I'm excited by the research, but worried that vulnerable people may be pushed to use it in harmful ways.