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Kayla-School-Scope

Kayla Stephens, a rising high school senior in Sacramento, California, during Stanford Medicine’s Summer Clinical Internship program. (Photo courtesy of the program.)

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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.