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Well, please, elaborate... This: http://www.sciencemadesimple.com/science-definition.html qualifies it as such. Furthermore, trend prediction is based on econometric models which are build with mathematics (calculus). Hence, one could consider economics as a practical application of mathematics to real world phenomena. This does not differentiate it *that* from computer science, now does it? *** ducks and hides ***

the atmosphere filters everything, but the blue.

Think about that for a second. If all other colors would filter, everything (including the sun) would have a blue tint to it. Actually, blue (and more consequently shades of purple) light is scattered which is what causes the sky to appear deep blue straight above you and consequently more of a pale blue near the horizon (the light is scattered a lot more before it gets to you due to the angle through the atmosphere). In fact, this scattering is what causes the sun itself to appear yellow or orange to us. The shorter wavelength light has been scattered instead of reaching us directly. So it's actually almost the opposite of what you said.

Here's a good, simple explanation: http://www.sciencemadesimple.com/sky_blue.html

http://www.sciencemadesimple.com/sky_blue.html The answer to "Why is the sky blue?" is reproduced from copyrighted material at sciencemadesimple.com

The sky isn't blue it only appears blue due to atmospheric scattering.
See: here

Dude, the sky is red. At least some of the time.

One of my hypothesis from high school was that all of the "laws" we've found to be true for our planet, may not hold true when applied arcoss the universe. The problem is that we're observing too small of a sample size. Our planet is a mere spec when compared to the total of all masses in existance.

Chances are, the laws we now know are correct... but only when applied to our planet. The displacement caused by the earth is what gives us gravity. Should the displacement of the Earth be altered by either adding or subtracting large amounts of high density molecules, then the gravity would also shift. The laws of science will only hold true when the variables being measures are the same. ie - The speed that light travels given our displacement will yield different results than the speed light travels when given a different displacement (namely, a quazar).

Is the sky blue?

Yes.

Why?

(source) [quote] The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.[/quote]

Yet if we were to observe the same sky from outer space, the same princinple does not apply. Now the sky is blue because you are looking down on many large bodies of water.

Perception is 9/10 of reality.