Q: You mentioned using a negative-ion generator as a possible remedy for seasonal affective disorder. ("Bright Ideas for Winter Blues," Dec. 1). But don't they create ozone and isn't that dangerous? —H.P. A: Bear with me for a quick chemistry lesson: A negative air ion is an oxygen molecule with an extra electron, a condition that occurs naturally...

This article is designed to show why the water we're drinking is bad for us, since it is highly unlikely that the urban water filters that are in place can filter out all of the little contaminants that are present in the water. Those contaminants are listed as part of the effects of urbanization on our water. These contaminants will acidify the water...