Someone in your way? You can ring your bell

If you've seen that YouTube video ( of someone ringing a handheld bicycle bell at random places in Japan, and then watching with amusement as people automatically jump out of his way, you'll appreciate the impact Kevin Nadolny's Runbell should have on runners in the city.

Nadolny, an American structural designer and avid runner, has miniaturized the bicycle bell into something small enough to slip on your finger but with a ding loud enough to warn pedestrians that you're coming through. It's a simple but effective idea that originally started as a Kickstarter campaign in 2014 and was upgraded with a new version in March.