< Literary Detective: On The Trail Of Invisible Ink
SCOTT SIMON, host: This is WEEKEND EDITION from NPR News. I'm Scott Simon. Families who took vacations this summer might have used portable technology to keep the kids quiet, like iPods or back-of-the-seat DVD players. License plate game, after all, can get just a little old after a while. But there's a reliable distraction that's been around for decades: the Yes and Know books - that's know as in K-N-O-W.
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