Riding (cycling) without a helmet is considered dumb only in certain areas of the world. Last time I checked, some countries refused to make it compulsory becau

Riding (cycling) without a helmet is considered dumb only in certain areas of the world. Last time I checked, some countries refused to make it compulsory because evidence was mixed (no references to hand, but the gist of it was that direct impact head damage at cycling speeds was less of a problem than whiplash/concussion, and the helmet only adds weight).