Despite our knack for whining about first world problems, there are still a few dudes left who think third world first. British designers Martin Riddiford and Jim Reeve have introduced  GravityLight with the world’s poorest nations in mind. This ingenious lamp gets its energy from simple gravity–no electricity required. Just lift the attached 22-pound bag of sand and let the gear-train and D.C. motor do the rest. One tug brings 30 minutes of light. [via]