http://www.bicycling.com/senseless/
I love this sort of mish-mash jumbled up pseudo science type of journalism. It is worth pulling out a non random quote
Dave Halstead, ASTM helmet chairman, remains staunchly unconvinced that a new helmet design might significantly reduce concussion risk. . . .
He believes that, in fact, the problem lies in the way the head is attached to the body.
or this
In light of previous studies, the data led the UCLA researchers to implore the medical community to "discard the magical notion that wearing a helmet on the head is sufficient to protect against impact brain damage."