text:  What happens is that those things are happening because they're losing dopamine neurons. By the time they lose 80% of their dopamine neurons, that's when the motor symptoms emerge. And that is, you know, the tremor. It's a resting tremor, so it's kind of unique to Parkinson's. Not to be confused, there's action tremors, essential tremors. But in Parkinson's, it's a resting tremor. And when you engage in a purposeful activity...