Apple boasts that the "Retina Display" on its new iPhone 4 packs in more pixels per inch than the human eye can identify, at 326 ppi. This new screen, from Casio and Toppan Printing, crushes it with a whopping 458 ppi. The real loser here: our suddenly inadequate-seeming eyes.
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.