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Bea and Belle

Bea White, with her sister Belle, was a senior in high school in 2017 when she was diagnosed with heart block, a condition that caused her heart to beat slower than normal. She had a pacemaker implanted on Sept. 6, 2019. (Photo by Anna Erickson White)

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Aging & Geriatrics

Photobiomodulation, the use of light waves to change human biology, has boomed in recent years for all kinds of purposes, at medical clinics and at home. We wanted to know what the science says — and doesn’t say.