Optical Society of America

Redefining time

Atomic clocks based on the oscillations of a cesium atom keep amazingly steady time and also define the precise length of a second. But cesium clocks are no longer the most accurate. That title has been transferred to an ...

dateApr 30, 2012 in General Physics
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Optimizing lighting for better learning

The intensity of artificial lighting has been shown to have a range of effects on our mood and our ability to concentrate. New research explores the color of lighting and its effect on our cognitive performance. The study, ...

dateApr 26, 2016 in Social Sciences
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