A national poll done by NPR with our partners at the Robert Wood Johnson Foundation and the Harvard School of Public Heath finds that more than 1 in every 4 Americans say they had a great deal of stress in the previous month….The poll asked people to say in their own words what was the biggest cause of their stress over the past year. By far the leading reason was poor health. Either they or someone in their family was really sick, or they were overwhelmed by the death of a loved one…..Money was another big cause of stress in our poll. More than a third of people with low incomes suffered major stress in the prior month…. Stress is such a big problem that those in authority — especially employers — need to find ways to make life more manageable, says Shafir, the Princeton psychologist. For instance, allowing workers to have predictable shifts would help them avoid constant stressful juggling of transportation and child care….