Kids who aim for top colleges know full well that this month's stress over which envelope—-thick or thin—is only the beginning. And in recent weeks, concerns about the pressure cooker environment on some campuses have escalated. At Cornell University in Ithaca, N.Y., there have been six confirmed suicides this academic year, including two on successive days last month. Last week, Cornell installed chain-link fencing along many of the bridges that cross the gorges on campus, serving both as deterrent and a physical reminder.