In the olden days, computer mice traced movement with built-in rubber trackballs. While these balls were a nifty way to control movement, the fact that they were made of rubber meant that they picked ...

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Q. My mouse is acting up. It feels like it’s rolling over gravel and it seems to skip. Do I have to buy a new one? A. You may need a new one, but in all likelihood all it needs is a good cleaning.