A brain scan study found that people with a depression-linked gene variant have less gray matter and weaker connections in the mood-regulating circuit. The circuit's connectivity accounted for nearly 30% of their anxious temperament.
SourceNIH/National Institute of Mental Health·JournalNature Neuroscience·DateMay 8, 2005
A study of nearly 5,000 students found that four years in small classes increased high school graduation rates by 11.5%. Low socio-economic students saw a more than doubling of graduation odds after four years in small classes.
SourceAmerican Psychological Association·JournalJournal of Educational Psychology·DateMay 8, 2005