Imagine a world where a poem was judged by the number of characters per line or the font in which it was published, or a violin concerto reviewed in terms of its precise conformance to metronomic beats or the posture of the violinist. This is what we are doing to education: Trying to measure beauty with a ruler.
Children's innate curiosity plays a big part in their "why" questions. Their curiosity about the world around them helps to build concepts, skills, vocabulary, and understanding of the unknown. And you can help channel their curiosity and need to know why so that you help foster learning in a positive way.