" I don't think there's any discernable difference in color between what my left eye and right eye see."

Try it with an objects of intense color in good light. The object that first brought it to my attention was a rose-red blanket in early-morning light.

We lose color perception with time, so kids can probably see the differences better than adults. I used to work in a fabric store, and I would often help a customer of 70 or 80 to match thread and fabric because she had lost that ability.

Women in general see color better than men do, though of course there are exceptions. It was men, of course, who named an orange and tan bird "the purple finch."

Donuel, I simply do not believe that your uncle could lick his eyebrows. Yuck!