Michael Finney has pleaded with you to buy one, and now has a warning. What makes a paper shredder so good is what makes it so potentially dangerous around your house. A close-up look shows steel teeth that can chew up more than just paper. Two-year-old Aaron Waters from just outside L.A. knows about it first hand -- literally. His fingers are all there now and he's fine, but there was a moment when that was not a sure thing.

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