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This document discusses combining application programming interfaces (APIs) to build new things. It provides examples of using weather APIs to control room temperatures, traffic APIs for smart transportation routing, and how services like Google Now use APIs to track weather and daily movements. The document also suggests using APIs to enhance functionality, such as unlocking attachment size limits for easier sharing of large files, and using location APIs to provide information about places near a property. It concludes by encouraging building new smarter things through the combination of APIs.Read less