The nuclear reactions The chemical reactions that we observe in our environment are due to the arrangement of the electronic configuration of two or more atoms to form different compounds. However, another

The screw of Archimedes Archimedes of Syracuse was an inventor scientist who lived in ancient Greece. Among his most important creations we can mention the screw, a very useful machine that was used to

During the 20th century, the world energy demand increased remarkably. The use of fossil fuels as an energy source brought with it serious pollution problems. Faced with this, other, more "clean"

The first use that was given to electricity, around 1880, fueled the daylighting. The old gas lamps and candles were replaced by electric bulbs. Towards 1920 came the valve radios, predecessors of modern