This new study sounds a lot like a 21st-century redo of Pavlov's experiments with dogs: show kids the McDonald's logo and watch their little neurons light up like the Fourth of July. The University of Missouri-Kansas City and University of Kansas Medical Center showed 10- to 14-year-olds more than 100 brands, then watched the results in an MRI. It showed their reward and pleasure centers flaring when they saw logos for food companies.
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.