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To the charging port's right, a small yellow light turns green when the battery's full.
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It is an interesting triple "coincidence, " which probably evolved over time, that our eyes are most sensitive to yellow-green light, which happens to be the characteristic color of sunlight as well as the color that can most easily be transmitted through the Earth's atmosphere.
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In addition to the numerical score given to each company, the Climate Counts scorecard also gives companies a green, yellow or red light rating.
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They are available in ten colors, including black, white, red, pink, light brown, dark gray, yellow, purple, orange and green.
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