I recently stumbled across 50 timeless blogging tips. One of my favorites was:
You do not really understand something unless you can explain it to your grandmother. Albert Einstein
Today, pick something you consider yourself an expert at and choose one small sub-topic or item that you want to explain (make sure it’s something your grandmother isn’t already familiar with, or you’ll defeat the purpose!). Using no more than one side of a sheet of paper, write an explanation you think your grandmother would understand. If you really want to test yourself, show it to her afterward!