Reading Time: 3 minutes This blog post originally appeared on the World Bank’s blog site.  By MARTIN HEGER and CRAIG M. MEISNER Imagine counting every car, truck, and bus in your metropolis’ streets for several days over eight years. That is exactly what we did in Cairo, with a little help from a satellite. We fed this high-frequency data into … Continue reading Clearing the skies over Cairo, one policy at a time