My microwave throws sparks when reheating leftovers — should I be worried?

At first, the riddle sounds impossible. How can something run without legs, fly without wings, bite without teeth, and even get cold? The clues seem to point in different directions, making it difficult to imagine a single answer that fits them all. Yet the solution is something we encounter every day, often without giving it much thought.

Think about the first clue: it runs but has no legs. Rivers run across landscapes, and water flows continuously through streams, pipes, and oceans. The second clue says it flies without wings. Water can become vapor and rise into the air, forming clouds that drift across the sky. In this way, it appears to fly despite having no wings at all.

The third clue may be the trickiest. Water has no teeth, yet it bites. Anyone who has jumped into an icy lake or stood under freezing rain knows the sharp, stinging sensation that cold water can create. People often describe that feeling as a “bite” from the cold. The final clue strengthens the answer even further: water itself can become cold, freeze into ice, or chill enough to make anyone shiver.

The answer to the riddle is water. Simple, familiar, and essential to life, it manages to run, fly, bite, and become cold without possessing any of the features we normally associate with those actions. That is what makes riddles so enjoyable—they challenge us to see ordinary things from an entirely different perspective.