This clever riddle asks:
“What gets sharper the more you use it?”
At first, you might think about a knife, pencil, or another object that can literally become sharp. But those things usually become duller with repeated use.
The clue points to something different. The more you exercise it by learning, solving problems, reading, remembering, and thinking, the stronger and sharper it can become.
That is what makes this simple riddle so satisfying once the answer clicks.
Answer: Your brain — or your mind.
