The Null Device

Bike helmets that raise a stink

The latest design innovation to improve safety: equipment that emits an unpleasant smell when damaged, strongly encouraging the user to replace it. The first test case of the technology is in bicycle helmets, though the researchers have plans for using it in other devices such as pressure hoses:
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).
The developers of the product have yet to decide on a suitable odour to use.

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