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The New Intelligence

You are explaining how to solve quadratic equations to a classroom full of 18-year-olds. Narrating as you map out the steps on a whiteboard, you occasionally scan the room for raised hands. No questions before you move on?

To tackle runoff, cities turn to green initiatives

Urban stormwater runoff is a serious problem, overloading sewage treatment plants and polluting waterways. Now, various U.S. cities are creating innovative green infrastructure — such as rain gardens and roadside plantings — that mimics the way nature collects and cleanses water.