What's The Best Answer You Ever Got To A Scientific Question?

Sometimes in science, it's all about the question. But, today, we want to know about the most perfect answer you ever got to a question you asked about science.

It could be answer you got yourself or that someone else gave you. It could be elegant or it could be funny. The answer could be in the form of a marvelously complete and concise explanation, but, it could also be an answer given in the form of a demonstration, an experiment, a diagram or a picture.

Tell us in the comments now about the question you asked, the answer you got, and what made it so good.

Image: NRAO/AUI.