We don't know the answers, but we never stop asking the questions. In each case we have taken steps toward the answer. Each investigator builds on the steps taken before, sometimes with new tools, and occasionally with the special insight which leads to a leap in understanding. Children might ask similar questions, and often do, They ask out of a natural curiosity about the world around them. They just want to know.
Children instinctively recognize the value of knowing just for the sake of knowing.
The best scientists are those who retain the somewhat naive curiosity of a child. The extraordinary artistry of nature is not enough by itself. It has to be understood and in that understanding is an even greater beauty. James Baldwin's eloquent description of the purpose of art applies equally well to science. The vision of a scientist complements the vision of the artist.