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This image shows the opposite sides of the Clear Rayz electronic acne-fighting pod. The device, once available only to professionals, has been redesigned for home use. One side of the computer-mouse-size gadget has 40 LEDs that emit blue light at a wavelength of 415 nanometers; this wavelength has been shown to kill the bacteria that cause acne. On the other side are 40 red LEDs that emit light at a wavelength of 633 nm, which soothes inflammation so that breakouts heal faster.
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Willie Jones is an associate editor at IEEE Spectrum. In addition to editing and planning daily coverage, he manages several of Spectrum's newsletters and contributes regularly to the monthly Big Picture section that appears in the print edition.