Amazing blade-less turbine, invented more than 100 years ago by Nikola Tesla. It's really tricky device. Do you know how it works? Check out this 3D model and try to figure it out.
Here's the original patent of this marvellous device:
Excellent! I myself have an interest in Nikola Tesla's work. If it wasn't for him, we wouldn't much of the technology we have now - especially alternating current and the transmission of that type of current.