He became interested in the idea of sanitation after taking part in a research project on the social and political development of cities.

VOA: special.2010.03.15

Well a number of you have spent this past week playing with this particular tool which is a project the course has been working on for some time in an effort to make it easier and more social to actually shop for courses.

在过去的一周里,已经有一部分人开始使用这种特殊的工具了,这门课程一直在致力于这一工具的开发,目的是为了让课程变的更简单,选课更人性化。

哈佛公开课 - 计算机科学课程节选

He calls the project an example of social entrepreneurship.

VOA: special.2009.06.29

It says a portion of profits from the project will be given as grants to social program.

VOA: standard.2009.09.13