Brian Christian's piece has a great premise:
In two hours, I will sit down at a computer and have a series of five-minute instant-message chats with several strangers. At the other end of these chats will be a psychologist, a linguist, a computer scientist, and the host of a popular British technology show. Together they form a judging panel, evaluating my ability to do one of the strangest things I’ve ever been asked to do. I must convince them that I’m human.
Fortunately, I am human; unfortunately, it’s not clear how much that will help.
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