I grow smaller the more I work, and I leave behind a trail of fine dust. I have a metallic head, but no thoughts. What am I?
A pencil.
As you write (work), the graphite wears down, and the metal ferrule holds the eraser, leaving behind pencil lead shavings.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Easy. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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