Wimshurst generator: how does it work?
Platinum-free catalyst
How is petroleum formed?
3D printed microrobot
Portable hydro power plants
Osmotic energy
What is PROCEL?
Visit to Osório Wind Complex
Thermal solar energy
Bypass and ladder for fishes in dams
News: first train moved by hydrogen
News: Robot charges electrical car
Direct-to-Cell: cellphone communication through satellites