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Senghor was released from prison in 2010 after 19 years. 'It’s taken me years to reconcile what my life was back then,' he said. (Ernest Sisson Photography)

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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.