When I give talks about AI, I bring a hammer on stage. Then I ask the audience a question: how many of you can use a hammer?  Every hand goes up. Of course it does. The hammer is a brilliant tool. It's fast and easy to learn. You can get proficient in an afternoon. And it's wildly versatile. You can build stuff, break stuff, pry stuff apart. You can use it to attack or to defend yourself. 

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