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Soundless earbuds channel light to photosensitive regions of brain through ear canal, supposedly replicating sun's mood-elevating powers. Finnair is conducting a one-month test.
Professional hockey players in Finland who wore the Valkee bright light headset 12 minutes a day sped up their already fast reaction times by 20 percent.
The local energy company says the lamps will be in place at 30 bus stops throughout the northern town of Umea.