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So Archie splits the men under his care as best he can into two equal groups. 所以阿奇就把他的病人平分 成两组人。他给其中的一半维他命C。他给另一半维他命B12。 He gives half of them vitamin C. He gives half of them

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Now I've been sort of banging on about this for the last couple of months, 在过去的几个月里，我反复在讨论这个问题， and people sometimes say to me, Well Tim, it's kind of obvious. Obviously trial and error is very important. 有时有

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You pump it at a high pressure through a nozzle. You create a spray of detergent. 你用高压将它压过一个喷嘴，你制造了清洁剂喷雾。 Then the spray dries. It turns into powder. It falls to the floor. 喷雾干燥后就成了粉末，

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Well let me give you an example. 让我来给你们一个例子。 Imagine for a moment that, instead of Tim Harford in front of you, there was Hans Rosling presenting his graphs. 你们想象一下，现在如果站在你们面前的不是我，而是

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