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The "Non-Reactive Data" Lesson is part of the full, Meteor course featured in this preview video. Here's what you'd learn in this lesson:

If a situation arises where a function should not re-run when a change in the data source occurs, the Tracker.nonReactive method can be used to avoid the re-execution. Chris demonstrates how to implement a non-reactive function and answers a few audience questions about order of execution.

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