Greg Campbell

Greg Campbell is the author of Blood Diamonds: Tracing the Deadly Path of the World's Most Precious Stones and other books.

Greg Campbell: Blog articles

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Video

Where Time Comes From

The clocks that coordinate your cellphone, GPS, and more

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Computer Vision Syndrome and You

Save your eyes. Take breaks.

Video

What Happens in 60 Seconds

Quantifying human activity around the world

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