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EnvironmentMercury in San Francisco Bay
There's a hidden danger that has been lurking in the San Francisco Bay since the days of Gold Rush mining: mercury. In 2008, the regional Water Board launched a multi-billion-dollar plan to clean up this potent neurotoxin, but mercury levels in fish and wildlife remain as high as ever.
Science Spotlight: How Your Smartphone Knows Where You Are
Learn how GPS works and how it was created.