Actually the first thing I learned that was new was on vacation when my hubby admitted he had learned he was red-green colorblind about a year ago! That may explain decades of disagreements about colors of paint for walls LOL.
The more interesting thing I learned actually was when I went to this website (Vision Simulator) and learned that there are 4 types of red-green colorblindness. This explains why hubby can indeed tell red from green in most situations. He has either L-cone reduced or M-cone reduced colorblindness apparently. We don't know which. Interesting isn't it?