Traditional wind turbines have gotten a bad rap from NIMBY folk and bird advocates, but innovator Mac Brown thinks he can sway the haters. Meet the Magenn Air Rotor System (MARS), a 100-foot-wide, helium-filled turbine tethered to the earth by a copper cable. Hovering at 1,000 feet, MARS is capable of producing 10 kilowatts of energy. “Picture a spinning Goodyear blimp,” says Brown. The governments of India and Pakistan have expressed interest in MARS, which was patented in October. As for the birds and the bats: “This thing is bigger than a house,” says Brown. “A bird can see it and a bat can sense it.”