They come out of the night, shuffling towards us slowly, inexorably – pitiless, mindless and voracious. They care for nothing but their own continued existence. Unchecked, they will devour everything in their path. They are the Zombie Ideas: ideas that seemingly died long ago but nonetheless still walk among us. Creationism, the Efficient Market, Iraq as the wellspring of the 9/11 terrorists, faith as inherently superior to reason – Zombie Ideas, every one, and there are scores more. They should be dead, but they won't stay dead.
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