On a sultry morning in early July, two undergraduates are hard at work in Alison Holliday's chemistry lab at Swarthmore College, a four-year liberal-arts institution on a pastoral campus a few kilometres outside Philadelphia, Pennsylvania. As part of Holliday's research into environmental contaminants, senior-year student Daniel Pak hunches over a syringe, desorbing pesticides. Travis Mattingly, a junior, tests for melamine, an illegal additive in pet foods and other products. During the ten-week summer break, research heats up in Holliday's lab.
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