[absynth]

Why is the sky blue?

rayleigh scattering.

what's that?

light from sun bouncing around.

why?

because it does.

why is it blue though?

green was taken.

why?

do you want chocolate or raspberry icecream?

chocolate!

yay!

(No, this isn't the best way. But it was A way and that was enough. The kid became a physics lecturer.)