Why is the sky blue?Simple. Direct. To the point. There should be a simple answer. Maybe someone could just tell us why and we'd be happy.
But a really intelligent man would answer the question while taking you on a tour of why it's such an interesting questions. Pointing out simple aspects of the sky you might not have thought about. Taking you down little detours that shed light (so to speak) on many things you may not have known about. All while doing so in a manner that we can understand, appreciate, and grasp.
In December 1968 C.V. Raman delivered a lecture for the Foundation Stone-laying ceremony of the Community Science Center in Ahmebadad. The Nobel laureate gave a speech called Why the sky is blue (and a scanned pdf).
I don't know a more wonderful excursion through physics, physiology, the world of colour, some astronomy, and much much more. All in a short speech that shows how a scientific view of the world can lead to wonder, awe, and amazement. I can't imagine how one could have listened to it and not wanted dig deeper and know more about everything.
It's well worth the read.