Al Letson performs one of his poems at the Stanford Medicine and the Muse symposium on April 17. 2019. Letson is the host of the radio show Reveal, from the Center for Investigative Reporting and PRX.(By Yuan Zhang)
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.