Greg Mortenson

  • Sakena Yacoobi

    Antony Hare Sakena Yacoobi began the work that has become her mission in 1992. That’s when she set up a school for Afghan refugees in Pakistan.…

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Where Time Comes From

The clocks that coordinate your cellphone, GPS, and more

Video

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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