Why is the sky blue?

Why do I have dry ear wax?

Why do women have orgasms and men have nipples?

Why do you ask?

Well, evolutionarily speaking, they serve no purpose.
Nice to have but superfluous.

"...between us..."

Actually, since there's more than two of us, it's "among us".

If I remember from a meteorology class I took many years ago, its because the skatter of light is proportional to the square of the wavelength. Blue is at the high end of the visible range so it dominates. Same reason the ocean looks blue when water is actually clear.

A good friend of mine is a crane operator on these high-rise building projects. He was on the Columbia Center here in Seattle and several other very tall buildings. He has asked me a number of times over the years if I would like to go up in one. Yikes. No way in hell. I would prefer to wait until the building is done, and even then it gives me the heebie-jeebies to be in a building that tall.

I was only talking to you though. Everyone else just decided to chime in. Not my fault.

Victor,

A few months ago the Herald-Sun published a really good diagram of the process of dismantling cranes.

Try searching the Herald-Sun website for it.

I think it is done in the middle of the night to keep everyone guessing.

Dave