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A SAS procedure based on mixture models for estimating developmental trajectories

Description Engage your students or community members in an educational and interactive activity with our "Dangers of Smoking" crossword puzzle, designed in honor of No Smoking Day

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6 Claude Teague, a scientist working on filters for the tobacco company RJ Reynolds, found that changing the pH of filters led these to discolour after smoking, thus creating the misleading impression that filters removed toxins and thus rendered smoking safe

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At Ground Zero: 25 Stories from Young Reporters Who Were There