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In this chapter we’ve seen that the most obvious sources of credibility—external validation and statistics— aren’t always the best. A few vivid details might be more persuasive than a barrage of statistics. An anti-authority might work better than an authority. A single story that passes the Sinatra Test might overcome a mountain of skepticism. It’s inspirational to know that a medical genius like Marshall had to climb over the same hurdles with his idea as we’ll have to climb with ours—and to see that he eventually prevailed, to the benefit of us all.