I love the color blue, is it a cross between any other colors?
It lies between violet and green on the light spectrum.  
Oh really? Does blue have any historical significance?
Blue lapis lazuli tones were used in ancient Egypt for jewelry.  I have a pin with blue lapis and it has flecks of gold in it.
Oh cool.  What else is good to know about the color blue?
Well, I'm a science nerd, so I am fascinated with the Rayleigh scattering that makes the sky and deep sea appear blue.  It's an optical effect.
Yeah how does that work? Do the particles only reflect blue light?
Exactly.  Since you brought up blue light, that reminds me of blue light flashpan signals used in flaires and mortar.
I have absolutely no iea what blue light flashpan signals are!
Today, think pyrotechnics, such as fireworks.  In the day, it was used to illuminate many things.