Google is your friend, you can read the source information yourself. :thmbsp:
Here are a few tidbits:
http://www.sciencedaily.com/releases/2012/06/120612115409.htm
"The Purdue Neurotrauma Group first gained national attention in 2010 for its work in studying the brains of high school players. But the research, which first focused on the effects of concussions, now shows something even more disturbing: More than half the players who never suffered concussions experience neurophysiological changes to their brain that often affects cognitive abilities.
"I don't know what the NFL said or didn't say to its players, but fMRI exams repeatedly tell this truth: Repeated blows to players' heads change the way their brains function for the worse," said Tom Talavage, a Purdue professor of biomedical engineering. "We may be putting too much focus on concussions. That is only the final straw after thousands of hits over several years.""
http://espn.go.com/espn/otl/story/_...e-concussion-research-universities-nationwide
http://www.ncaa.org/wps/wcm/connect...gue+practice+plan+tackles+concussions+head-on
http://espn.go.com/espn/otl/story/_...-kids-football-head-hits-severe-college-games
http://espn.go.com/espn/otl/story/_...e-concussion-research-universities-nationwide
http://sportsillustrated.cnn.com/20...al-sports-concussion-outcome-study/index.html
http://www.mlive.com/news/kalamazoo/index.ssf/2012/10/concussions_hit_home_what_the.html
http://www.nichd.nih.gov/news/resources/spotlight/pages/020612-concussions.aspx
"Don't let the word "mild" fool you—even a little bit of trauma to the brain can cause big problems with thinking or memory, movement or mobility, speaking or understanding, and personality or mood in the short and long term. Some research has also linked repeated head injuries to a long-term degenerative disease called chronic traumatic encephalopathy (CTE), which has symptoms similar to Alzheimer's."
http://www.cnn.com/2012/09/05/health/nfl-neurodegenerative-disease/index.html
"Just hours before the 2012 NFL season kicks off, a new study suggests that professional football players are three times more likely to have neurodegenerative diseases than the general population.
When researchers specifically looked at Alzheimer's disease and ALS -- amyotrophic lateral sclerosis, also known as Lou Gehrig's disease -- that risk increased to four times greater than the rest of us.
The study, published Wednesday in the medical journal Neurology, surveyed nearly 3,500 retired NFL players who were in the league between 1959 and 1988."