Well for one, you can talk to it. By typing a normal sentence you can talk to Subjex.
Users can ask it to do searches, knock knock jokes, and have personal conversations with it.
But there is a lot more that separates the Subjex search engine from others. Today - most major search engines are flawed. While Natural Language has improved Internet search to a degree by allowing users to ask full sentences, it is far from a viable solution for decreasing user frustration. It is impossible for any of today's search engines to know that - unless they ask the USER follow up questions. In other words, dialogue.