ChallengeYourWorld.com's mission is to foster a new generation of socially responsible, environmentally friendly, and financially viable companies. We asked Yaya & Momo to share their idea on it. Step-o-tron: We walks around 6000 steps per day (2 million steps each year). This shoe-system with an integrated newton-generator can capture this energy and store it on a built-in power card. By Yaya & Momo, aka Markus and Karin Hofko produce a wide range of artistic works mainly with video.