The team subjected 13 study participants to repeated scratching while monitoring their brain activity with an MRI machine. Scratching effectively dampened the activity in areas of the brain associated with unpleasant feelings. But it also boosted activity in brain areas linked to compulsive behaviors, which may explain why we can't stop. The participants in the study weren't subject to an itching sensation, though, so there may still be some questions to resolve.
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.