We're glad you're using a bike helmet (and we're glad you've opted for that really scary one we first saw in 2007). You do realize, however, that the more blows to the head you receive, the less effective the headgear is, right? Researchers at Germany's Fraunhofer Institute have developed a manufacturing process that injects microcapsules containing malodorous oils into the helmet itself, causing it to stink when damaged -- alerting you that it's time to replace it (and making it difficult to try and make do with a less than safe one, at that). Ind
