If your paper shredder has gotten a bit dull and isn’t working very well, you don’t need to think about replacing it just yet. You can easily sharpen the blades by simply running a couple of sheets of aluminum foil through the shredder. This works much in the same ways as cutting foil sharpens dull scissors. Ehow recommends doing this every few weeks to keep your shredder sharp and efficient.

Source: eHow via Lifehacker