He hired scientists skilled in tracking eye movements to prove that yellow-page readers flipping through directories were drawn to full-color ads.

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The Sydney Morning Herald came up with a nifty idea by framing its front page in a yellow border.

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When the cobrowser has Zbubbles, the screen carries a tiny gray "z" that turns yellow whenever it hits a Web page that has been tagged as offering, or even mentioning, a product for sale.

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If you look at the first graph (on page 2) you will see Apple (blue), iPhone (red) and Samsung (yellow) plotted against each other.

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