Southmead hospital in Bristol, England, is believed to be the first in the world to implant a tiny deep brain stimulation device into a brain to reverse the symptoms of Parkinson's disease. Tony Howells, the first to receive the new treatment in 2019 as part of a trial, said the impact was amazing. "You can't understand how frustrating it is until it happens to you. Just doing your shoelaces up is a major operation... it affects your everyday life no end." Now he can play golf again and do things much more quickly than before. Parkinson's disease causes involuntary shaking, slow movement, and stiff and inflexible muscles. If the trial continues to be successful, about 14,000 of the 140,000 people living with Parkinson's in the UK could benefit, says neurologist Dr. Alan Whone. Twenty-five patients have been selected for the trial that concludes next year.