#Change11 Why the sky is blue?

I remember reading those books with the “ten thousand why?” when I was a boy.

One of the questions that puzzled me was: Why the sky is blue?

Here is an explanation of why the sky is blue in this interesting lecture by Professor Walter Lewin.

I have once created a post of Why the Sky Is Blue here.  It seems that wikipedia does provide a good explanation of Why the Sky is Blue.

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