The biggest telescope dish right now is at the Arecibo Observatory of Puerto Rico. This dish took three years to build (1960-1963) and, clocking in at about 20 acres in size, has enjoyed a 50-year reign as the largest telescope dish. The gaping depth of the bowl makes the dish much more sensitive, so scientists using the telescope can collect as much data in minutes as smaller telescopes could in hours.
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.