Desalinization technology has long been trapped between two competing nightmare scenarios. Without desalination, fresh water resources run out and large swaths of the earth suffer crippling water shortages. But if we desalinate on a large scale, we keep burning fossil fuels, the earth warms, the ice caps melt, and sea levels rise to wreak havoc on coastal regions.
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.