Blue is one of the three primary colours of pigments in painting,what's your color preference?
I personally love red. Why do you like blue?
Because whenever I look at the daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering.
Rayleigh scattering? What is that? I have never hear of this. 
Its the is the (dominantly) elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation
I see, what else do you know about the color blue?
blue may differ in hue, chroma (also called saturation, intensity, or colorfulness), or lightness