An Explosion of Green

The reforestation of the eastern United States—thanks partly to conservationists and mostly to accident—can show the developing world how to make room for people, farming, industry, and endangered species of plants and animals, which have been returning. We can give the rest of the world a better example if we address the problems that even this fortunate region still faces


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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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