The color blue is everywhere! Its the color of the sky and the color of water! What would we do without the color blue?
I love it. It's one of the three primary colors of pigments that are the building blocks for all color. 
Yes! There's no purple without blue and no green without blue too!
I find it crazy the human eye can only see blue with a dominant wavelength between approximately 450 and 495 nanometres. Any other wavelength and you can't see it. 
That seems like a very narrow range? Are other colors like this?
I'd imagine all of them. Blue is a crazy color. Do you know blue are are not really blue, a optical effect called Tyndall scattering explains blue eyes.
Can you tell me more about that? I have blue eyes and I love them on other people because they are somewhat rare
They appear blue due to the scattering of light by the turbid medium in the stroma of the iris.