NFL Linebacker Chris Borland’s recent decision was a brave one; he walked away from a $3 million contract over the issue of concussions.

Last August, the 24-year old Borland was just starting out as a rookie linebacker for the San Francisco 49ers. During his first training camp he suffered a concussion. But he continued to play through the day and through the rookie season. Even so, the issue of concussion kept bothering him and he began researching the data. He found plenty, enough to change his mind about a career in football.