The study [0] linked at the bottom of the article has good insights on that, plus it's a marvelous read all around. [0] https://web.archive.org/web/20060612212

The study [0] linked at the bottom of the article has good insights on that, plus it's a marvelous read all around. [0] https://web.archive.org/web/20060612212953/http://people.csail.mit.edu/rahimi/helmet/ https://web.archive.org/web/20060612212953/http://people.csa...