prove what you know?

I just learned that you can't always prove what you know, and that's ok, you can still know it. A simple fact we overlook many times. I can't prove that I ate Oatmeal today, or that I had a pain in my ankle on Tuesday night, but both happened and I know them. Next time someone tells me to "prove it" because I "know it" I'll help them understand you can't always prove what you know. To prove something you have to have publicly accessible criteria. Thanks Dr. Walls.