Here is my question. Why does it happen that as a person ages (for most people over 50), half the eyebrow goes white and the other half doesn't? The side of the eyebrow closer to the ear goes white, while the side closer to the nose doesn't. My own eyebrows are like this, and I've noticed, over a long time, most people's are the same. What causes this? Is it blood supply, or what? Think about it, and look around at older folks.
Another silly thought I had!