Every now and then I make a mistake and have to issue a public apology. Today, I am in the position of having to write a highly embarrassing apology to Brice Horton who was the subject of my recent column "Horton Hears the Who" and my not-so-recent column "Expel Brice Horton." My apology is largely motivated by Mr. Horton's recent threat to sue me for defamation of character. That written threat follows in unedited form: "Mr. Adams, I would appreciate it if you would delete your posts about me. My roommate is an attorney and says that we could go...