For fucks sake, no. This is a meme that will not die.

Howie's evidence (as nice a guy as he is) is based on a single study by a professor at the University of Bath. (And there's a PLOS One paper which disputes his conclusions too which is worth reading: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjourna... )

There is no compelling evidence to recommend that you shouldn't wear a bike helmet and PLENTY of very solid evidence why wearing helmets have very important and life altering effects on the outcome of serious head trauma.

If you are cycling, wear a bike helmet.