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Happy anniversary to the Post-it Note

The Post-It Note will celebrate its 30th anniversary this year. This was an accidental invention and is now a popular office supply item. We have a few materials that feature the post-it:

Why didn't I think of that? : 101 inventions that changed the world by hardly trying by Anthony Rubino, Jr

Accidental inventions [videodisc] : 10 inventions, 10 extraordinary stories

The kid who invented the trampoline : more surprising stories about inventions by Don L. Wulffson