Johns Hopkins researchers were offering people $ 600 to participate in a trial study of a vaccine against the flu. For the trouble of two blood draws, the drinking of a (real or placebo) foamy orange-flavored oral vaccine and the promise of another blood draw should illness strike, I was to be recompensed more than the cost of three weeks of room, board and six-hour-a-day Spanish language instruction in Antigua, Guatemala, where I had plans to study. I signed up, feeling like a lottery winner, even though the first blood draw left a foot-and-a-half-long bruise on my arm, like none the nurses had ever seen.

Internet: <http://www.nytimes.com> (adapted).

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The amount to be given to participants in the trial exceeded what was necessary to pay for accommodation, meals and Spanish classes in Guatemala.