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Essential tremor afflicts up to 10 million Americans, and most experience life-­complicating shaking of the hands. Cala kIQ is a wearable, rechargeable device that sends electrical impulses from the wrist to the brain, to lessen the physical effects of misfiring neurons and temporarily let the wearer do things like hold a cup with more ease. It’s also approved for patients with Parkinson’s. A peer-­reviewed study found that 80% of patients receiving the type of therapy delivered by Cala kIQ saw tremor power cut at least in half

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