Temperance. Silence. Order. Resolution. Frugality. Industry. Sincerity. Justice. Moderation. Cleanliness. Chastity. Tranquility. Humility. Benjamin Franklin's 13 virtues. "He committed to giving strict attention to one virtue each week so after 13 weeks he moved through all 13. After 13 weeks he would start the process over again so in one year he would complete the course a total of 4 times."
Play with a virtual ecosphere. [Flash].