Grabbing a coffee cup seems easy. But you need to be able to move your hand, stretch it out, and keep it steady. 

These movements are difficult for people with Parkinson’s disease. The disorder eats away at brain cells—called dopamine neurons—that control movement and emotion. Symptoms begin with tremors. Then muscles lock up. Eventually, the disease makes walking and sleeping difficult. Thinking gets harder, and as neurons die, people lose their concentration and memory. 

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