I was on a conference call with a group of IT application architects, and, with a few minutes left until the end of the scheduled hour, the summary of the meeting began with that phrase: "History teaches us ...". As an amateur historian, my interest was immediately piqued. The end of the sentence was "that a three-tier architecture is the best architecture."
Had it not been for that three-word preamble, I would have let the assertion stand unchallenged. But Clio had been summoned -- and I had to disagree.