Before it becomes visible Parkinson disease, those who will suffer from it begin to write with increasingly smaller handwriting. Even before they realize it themselves, they hold down the cell phone keys longer when they send a message. And several years before the diagnosis, the first movement disorders occur. By the time the doctor diagnoses it, the 60% or more of the neurons that produce dopamine have stopped doing so, making the tremor, muscle rigidity, depression extremely evident... Now, an investigation with thousands of people who wore smart watches on their dolls have been able to anticipate who will be ill long before it becomes visible.
