Censorship has been in the news a lot lately. You have probably heard it mentioned in relation to Donald Trump. Twitter, Facebook, and many other online platforms permanently suspended his accounts last week. That's pretty wild, but there is a lot more worth talking about than any one person losing their Twitter account. In the past, censorship has taken many forms. Originally, it involved physically stopping people from speaking, either by violence or threat of violence. Then, as speech moved to paper it involved destroying scrolls and later books. George Orwell, in his classic book 1984...