1.   And the new work raises the possibility that optimism may help prevent people from getting sick during stressful times, Dr. Segerstrom said.

2.   In the view of the late historian Alan Heimert, postmillennial optimism helped ignite and fuel the American Revolution.

3.   Meanwhile, foreign investors, whose excessive optimism had helped create the bubble, ran for the exits.

4.   Prices were also helped by optimism that the government is about to make a decision on raising oil prices.

5.   Such ingrained optimism has helped keep the economic and political structures of the country intact.

6.   That optimism has helped to buoy the recent revival of the stock market, which has come amid the increased volatility that often comes when markets are turning.

7.   That optimism helped buoy Veronica through the seven months of waiting, she says.

8.   The market was also helped by optimism that lower interest rates in the U.S. will lead to more demand for goods from Japanese exporters.

9.   The rally was helped by optimism that statistics this week, especially the May employment report on Friday, would show further evidence of weakness.

10.   There is no sign that their optimism has helped to dispel the haze of fatalism that engulfs their parents.