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When the sun goes down, the hydrogen powers a fuel cell that runs your home.
FORBES: Cheap Hydrogen From Dirty Water...Maybe
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As the sun goes down, the crew dons night-vision goggles, scanning for muzzle flashes or smoke trails.
NPR: Adrenaline Flows When Medevac Unit Takes Flight
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Today, when the sun goes down in Africa, over 150 million homes will not turn on the lights.
FORBES: How to Light Africa Within a Decade
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This fortress becomes crucial when the sun goes down and the undead rise.
FORBES: Connect
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But after the sun goes down, geishas recede behind closed doors and teahouses shut down for the night, Kyoto offers spectacular nighttime charms.
BBC: Where to find Kyoto��s glow
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Since San Juan is largely without power, when the sun goes down darkness prevails, pierced only by the occasional flicker of candlelight.
BBC: Journey to Argentina's forgotten territory
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It's starting to wonder why you so remind me, why you so remind me, of the same (unintelligible) when the sun goes down.
NPR: U.K.'s Arctic Monkeys Try to Win American Fans
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From sandy riverbed campsites you can watch flocks of colourful parrots as the sun goes down, and the night becomes even more eerie when dingoes fill the darkness with their howls.
BBC: Walking through Australia��s pure desert heart
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Business might be slow, but along with the fortune-tellers and healers, the henna tattooists, acrobats and gnaoua, the spiritual musicians, they know the importance of claiming your space before the sun goes down and the big breaks come.
BBC: Djemaa el Fna, the beating heart of Marrakesh
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When the sun goes down, crossing the line between the City of Light and the City of Darkness is eerie, almost post-apocalyptic: moving within minutes from the bright lights of Times Square to the narrow unlit streets of the Financial District with the looming outlines of skyscrapers towering overhead.
BBC: Storm Sandy: New York's dark and bright sides
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When the device is aligned so that its pits are pointing straight at the sun, most of the incident radiation goes down them to their bottoms.
ECONOMIST: Solar power