A Bike Strengthens the Rider: On Building Cyclical Tools

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Sep Kamvar suggests a mission when building tools: Every tool should nourish the things upon which it depends.

How Much Is a Good Teacher Worth in Cash?

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If the bottom 8 to 10 percent of poor-performing teachers were replaced with average teachers, the U.S. could jump to the top of international math and science rankings and bolster the GDP by $100 trillion.