Yes, you really do need a bike helmet Even mild concussions can cause lasting brain damage – Consumer reports
Savannah Morning News
December 14, 2014
[…] The scans showed signs of damage to nerve cells in the brain responsible for transmitting information, compared with a group of 33 people without brain injury who also had MRIs. The injured people also performed 25 percent worse, on average, in a “verbal letter influency” test, which evaluates thinking and memory skills by seeing how many words one can think of that begin with the same letter. […]