Air-Purifying Concrete Paving Stones Remove Nitrogen Oxides from Vehicle Emissions
Researchers from the Eindhoven University of Technology in the Netherlands claim to have invented a new type of paving material that actually removes some pollutants from the air as vehicles travel over the surface. Combined with concrete or normal asphalt, the new material is able to eliminate 25% to 45% of nitrogen oxides from vehicle gases.
DIY Stirling Engine Boat Tutorial
There are many ways for building a stirling engine boat. You can either use a frame of square lumbers or fiber-reinforced plastic.
However, piling thick...
