To resolve that question would have required locking varying size groups of college students in separate rooms for a year or more to see whether larger groups altered brain structure in some way. (scientificamerican.com)
A third group of college students served as controls and did no special exercise program. (liveinthenow.com)
The only group of college students that increased their ownership of credit cards in 2012 were seniors, but not by much compared to previous years. (debt.org)