What if you could go to sleep with a vision problem and wake up with a crystal-clear view of the world? A Spanish optometrist not only says this is possible, but he actually wants you to sleep in your contacts. His patented contact lenses, designed to achieve the same effect of corneal reshaping surgery, can correct vision defects like myopia (nearsightedness) and stigmatism – and now hyperopia (farsightedness) – without taking sharp instruments or lasers to your 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.