I heard this story on NPR and this part highlighted why we're here:
"There are lots of factors that may explain changes in IQ. Though this study did not attempt to nail them down, lots of prior research has found that educational environment is key. Some researchers have found that rigorous academic curricula lead to improved IQ scores."

http://www.npr.org/blogs/health/201...study-that-finds-big-jumps-dips-in-teens