By Ian Chant
Posted 06.26.2012 at 5:29 pm 8 Comments
It took Hubert Pissavin two weeks in his garage to build a machine that would do his least favorite chore for him: mowing the lawn. The retired electrical engineer started with a simple, boxy chassis made of wood. With four motorized wheels and a spinning blade, the battery-powered device moves in a straight line until it bumps into an obstacle, which activates a relay switch that backs the mower up about three feet.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.