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Simplified power factor correction: Sensorless control could enable smaller, more reliable electronic adapters

Single-phase power factor correction (PFC) circuits—a kind of front-end AC/DC converters—are ubiquitous in a variety of ...
National Geographic news

LED light therapy for skin is trendy—but does it work?

Dermatologists explain the science behind wildly popular treatments like red light therapy, which is now available at home—for a steep price. Full-face LED masks like this one can cost up to several ...