I agree with Will, sometimes the answer is the end of a very long series of questions or sometimes the answer doesn’t get you anywhere. There are often times when things don’t work, the answer isn’t what you expect, but you just think of new and better questions. That’s why science is fun
The best kind of question to ask, is sometimes one that creates new questions.
That’s a principle I try to use when designing an experiment. You need to have an idea of what result (or possible results) you expect, and what the consequences of these different results might be. It’s best not to do an experiment where you don’t have some idea of the possible result – you can waste a lot of time that way!
The hardest question in the world, for scientists, parents of small kids, teachers, everyone, is ‘Why?’. And ‘why’ will always be there. Makes me quite happy actually, as it means that there’s always more to explore, more experiments to do, and more answers to find, to then ask even more questions!