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getting more serious. The researcher John Hearne describes research in Singa- pore,where it was determined that about a third of the people who die of lung cancer each year were women who never smoked,but got it from cooking.He points out that while we have plenty research on the impact of PM2.5 outdoors,there is very little on the health impacts of these particles when they are generated inside the house.He says that we don't really know how the particulates are affecting us,and we have no idea of how effective sealed covers are. The retired scientist Max Sherman says,"The problem now is the various rating systems that are out there will tell you what the power is or what the flow rate is but not how good it is at