Here's an interesting and low-tech communication device for runners: A finger-worn warning bell. Oregon-based inventor Kevin John Nadolny reckons it's more effective (and perhaps less rude) than simply screaming "On your left," particularly since pedestrians around the world are already conditioned to react to bicycle bells. "Runbell is extremely loud and can easily be heard from more than 30 feet away. People have plenty of time to react. They can move left or right and you can still...

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