How far away is your school? Are there more fast food joints than farmers markets in your neighborhood? Is your doctor close enough to help you in an emergency?

Today, more than half of the world's population – that's more than 3.5 billion people – lives in cities, and cities contain the majority of services like schools, markets, and hospitals. Experts predict that by 2030, urban area will double worldwide, shifting more people into cities. However, to some, access to urban services is no...

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