Check out a free preview of the full Interactive Data Visualization with D3.js course:
The "Audience Questions and AJAX" Lesson is part of the full, Interactive Data Visualization with D3.js course featured in this preview video. Here's what you'd learn in this lesson:

Ian field a few questions from the audience regarding the brush generator example. During the process of answering the questions, Ian demonstrates a color scale and address D3's AJAX convenience methods.

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