One of my kids' parents shared this article with me just before graduation as a way of thanking me for challenging her daughter and pushing her out of her comfort to the place  where learning begins. I have my students study the Holocaust and other genocides, but we don't stop there; together we wade into the controversial waters of current events, which, in today's climate of coddling and intolerance, can be (and sometimes has been) a controversial move on my part, but the benefits generally outweigh the risks, and I am far too old to start changing now. Besides, parents and kids like the ones I just mentioned make it all worthwhile.