Some people have yellow in their eyes, did you know that?
Yes, I did know that. It is the color between green and orange on the spectrum of visible light.
Seem to very knowledgeable. Surfboards turn yellow over time. Not a big fan of that. 
speaking of turning surfboards yellow over time.Although it's not considered an ionizing radiation because its photons lack the energy to ionize atoms, long-wavelength ultraviolet radiation can cause chemical reactions and causes many substances to glow or fluoresce
That makes sense. Softballs have a different yellow color. More florescent. 
I play softball right now with from friends in the summer time. Also the name "softball" was given to the game in 1926, because the ball used to be soft.
I wonder how many different colors of yellow there are. 
I am not sure but I know that Crayola manufactures several different types of colored pencils in the shades of yellow. 
I was thinking the same thing. Have you ever heard about the yellow submarine?
haha yes, we all live in a yellow submarine by the Beatles is a great song