Several sharp-eyed readers asked me to explain how the Aztecs managed to do this, since the Aztecs lived in Mexico.

Arithmetic and Fertilizer There was a bit of "arithmetical absurdity" in the Q & A column of Feb. 23, as James Fechheimer of Glen Head, L.I., among other sharp-eyed readers, pointed out.

The existence of this money is not a secret, at least to sharp-eyed readers of the small-print legal advertisements in newspapers.

A Hopeful Sign for Yanks A sharp-eyed reader - a Red Sox fan, no less - noted that Kansas City's three-game sweep of the Yankees last week was only the third time that the Yankees were swept in a series by the team that had the worst record in the majors at the time.

Herb did it anonymously, of course (though a sharp-eyed reader might have guessed from the drawing of "Prudence" that accompanied the column if they hadn't already been tipped off by the tone).

Windham mountain and sharp-eyed readers

Examples of purposely flawed handiwork can be spotted by sharp-eyed readers of print ads for products like Miller Lite beer, Pioneer car stereo systems, and apparel and other merchandise licensed by the N.B.A. Properties unit of the National Basketball Association.

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