Secretaries turned out during their lunch hour; housewives with kids queued up before trips to the supermarket; businessmen stopped by after a day at the office. Wherever the blue-and-white trailer picked a place to park in Cleveland, crowds gathered for a free drink of flavored corn syrup. And two hours later the drinkers returned to the trailer. Not that Clevelanders were afflicted with a sudden thirst; on their second visit, instead of getting another shot of syrup, they donated a blood sample. A technician smeared the blood on chemically treated cardboard. In...
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