作者：Josh Chang

　　Language learning is the indispensable in my life, but I got interests elsewhere. Besides shooting the hoop, I worship Logic. I never extravagant to be logician, but I’m fond of having the vexed logic theoretical debate with Fran and other dialectician. That’s the mine where we dig joyance, and we call it joy walking miner! Anyway, right here I’m please to share it with you.

　　Let me spread you a story that can enlighten your thinking--

　　Once upon a time, there’re two kinds of tribes live in one mountain. Namely, human and vampire. Three years ago, there happened a severe disease and it made half of the human and half of the vampires out of their mind. They are intelligent human, unintelligent human, intelligent vampire and unintelligent vampire. Outwardly, you cannot distinguish the difference between them, but deep down inside, they’re totally different: All the intelligent human are honest, they always tell the truth; and all unintelligent human are liars, they never tell the truth. The characteristic of vampire are just on the contrary side. All these four kinds of resident live together and they’re all straightforward people. When they meet a question, they just simply use two words in their answer: Yes & No.

　　Here the story begins: One day, a scholar came to investigate that mountain, and on his way to the peak, he met a guy. The scholar really wanted to know which kind the man belongs to? And whether the man is intelligent or not? According to the above, you’re allowed to ask that guy two questions, then you’ll help the scholar to get his answer.

　　Questions & Answers:

　　Step 1→

　　Ask the guy: “Are you Unintelligent?”

　　The four answers will be:

　　Intelligent Human: “No, I am not.”

　　Unintelligent Human: “No, I am not.”

　　Intelligent Vampire: “Yes, I am.”

　　Unintelligent Human: “Yes, I am.”

　　Then you can conclude that the guy is Human or Vampire.

　　Step 2→

　　Right now you have an alternative choice.

　　Choice 1:

　　Ask the guy: “Are you a human?”

　　The four answers will be:

　　Intelligent Human: “Yes, I am.”

　　Unintelligent Human: “No, I am not.”

　　Intelligent Vampire: “Yes, I am.”

　　Unintelligent Human: “No, I am not.”

　　Choice 2:

　　Ask the guy: “Are you a vampire?”

　　The four answers will be:

　　Intelligent Human: “No, I am not.”

　　Unintelligent Human: “Yes, I am.”

　　Intelligent Vampire: “No, I am not.”

　　Unintelligent Human: “Yes, I am.”

　　Up to now, I am sure you can judge the species of all kinds.

　　Unless, you’re an unintelligent human! Or an intelligent vampire! Gee…