Solar food dehydrator
Drying food in the sun is a method of preserving food known for thousands of years. To this day in many, especially the poor and to the equator the closer countries, dried foods in direct Sunlight. The most commonly
Panemone větrná turbína
Vertical axis wind turbine, an invention more than a millennium old, or also a patent from 1977 and one of the stepping stones for other modern turbine types.
Parabolic solar cooker
The folding parabola with leaves decomposing like the petals of daisies. Or also a futuristic tube with a reflecting surface, into which you put the raw meat and pull the finished steak. Such are the forms of Solar,
Domestic biogas plant
Biogas plant at home in the backyard? Many agricultural cooperatives has today in the premises of the biogas station. The idea of home bioplynky in this context is somewhat surprising. Yet, in countries in Asia and Africa small