The Hypothesis When it comes to gas mileage, it's not only what you drive but how you drive.
The Challenge Over 195 miles of interstate, get better gas mileage from a full-size truck than a midsize car. Use any means necessary to improve the truck's mileage, but leave the car untweaked. (We added 600 pounds to each to simulate three passengers and their stuff.)
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.