(PhysOrg.com) -- You’ve seen it on television: A doctor shines a bright light into an unconscious patient’s eye to check for brain death. If the pupil constricts, the brain is OK, because in mammals, the brain controls ...
Other
Nov 2, 2011
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The brightness of the nightly sky glow over major cities has been shown to depend strongly on cloud cover. In natural environments, clouds make the night sky darker by blocking the light of the stars but around urban centers, ...
Environment
Mar 2, 2011
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The Channel Island of Sark has been designated the first dark sky community in the world in recognition of the lack of light pollution that allows clear views of the stars at night, officials said Monday.
Space Exploration
Jan 31, 2011
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