[snip] "Neighborhoods where more people have professional or managerial jobs are protective against violence," says one of the coauthors of a seven-year study of a diverse set of Chicago neighborhoods published in the American Journal of Public Health. Why do some kids turn violent and others don't? The authors found little role for IQ, poverty, or hyperactivity. According to a Harvard press release, "approximately 60 percent of the difference was explained by neighborhood environment, parents' marital status, and immigrant status." Kids with married parents were less violent, as were kids who were first- or second-generation immigrants.
[snip] "Trees are horrible to one another, and redwoods are viciously aggressive," writes Richard Preston in the New Yorker. "They drop large pieces of dead wood on smaller neighboring trees, which typically shatters the tree. [One scientist] calls this phenomenon 'redwood bombing.' In this way, a giant redwood suppresses and kills trees growing near it, including hemlocks, spruces, Douglas firs, and big-leaf maple trees."