" The perception of human dignity, Mr. Pinker went on, is no different from how "converging lines in a drawing are a cue for the perception of depth.

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Within the app, you can record your own swing using your device's camera and replay it, including in slow motion and reverse, while drawing lines on the screen to monitor your positions, just like Johnny Miller.

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"You have an agency that comes in and is pretty aggressive on these issues, but isn't really clear on drawing lines, " he said.

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