Submitting a DNA sample to networking company 23andMe entails spitting a saliva sample into a plastic vial. 23andMe hide caption

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Search For Parkinson's Genes Turns To Online Social Networking
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In a study, patients with Parkinson's disease, a progressive nervous-system disorder, had fewer falls after taking up Tai Chi. iStockphoto hide caption

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Tai Chi May Help Parkinson's Patients Regain Balance
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