Proponents of modernisation tend to fall into two camps, optimists and pessimists. Participants in the technological unemployment debates can be broadly divided into optimists and pessimists. Though there is a bias towards negativity, some people are optimists and others pessimists. The Drake equation has been used by both optimists and pessimists, with wildly differing results. Optimist International signed up the first Friend of Optimists in 2005. Seeking to explain the correlation, researchers find that optimists choose healthier lifestyles. When facing performance situations, strategic optimists feel that they will end well. Optimists are one of the smallest sailing dinghys. For some glass-half-full optimists, that may be true. The following season, Palace achieved far more than even the biggest optimists expected. The magazine for pleasant optimists who frown on convention. Service clubs include Rotary, Kiwanis, Optimists, Lions, the Point Loma Assembly, and the Thursday Club. Also in 1994, Campbell co-founded "Liberty City Optimists", an inner city youth sports program. Or, to optimists, to get a second life. Optimists can be sailed by children from age 8 to 15.