Some are philosophically based. Some do work for the government on government contracts addressing particular issues.

VOA: special.2010.09.27

The results of the work, based on brain studies of Denise and other patients,were published in the journal Science.

VOA: standard.2010.01.28

"Based on the interests of the three countries, if we work together, if we analyze our problems and also explore solutions to those problems .

VOA: standard.2009.05.24

"It is certainly our hope that based on discussions in Pyongyang that the six-party talks resume expeditiously and we can get back to important work of denuclearization."

VOA: standard.2009.12.11