anchor.diff:  :apiman: http://www.apiman.io
   :wiki-context-switching: https://en.wikipedia.org/wiki/Context_switch#Cost
   :quasar: http://www.paralleluniverse.co/quasar/
  +:tweet: https://twitter.com/jetdrone/status/787532093186306049
   :toc: macro
   :toc-title: Sections
   
  
positive.code:     },
      res -> {
          if (result.succeeded()) {
              System.out.println(String.format("Does %s rhyme with gravy? %b"), word, res.result()); // <3>
          }
      }
  } );
  
negative.code: vertx.eventBus().send("com.rhymewithgravy.com.doesit", // <1>
      "apples", // <2>
      reply -> {
          System.out.println("Does apples rhyme with gravy? " + 
          	reply.result().body()); // <3>
      }
  );
  ----
  