Pre-packaged pet foods became available towards the beginning of the 1900s in the United States.

Fly ash and bottom ash are byproducts generated during coal combustion in a coal-fired power plant.

Lithium is a soft alkali metal with a silvery-white color and, under normal conditions,  it is the lightest metal on… Read more »

The use of biomass by modern humans  for energy is older than their emergence as a species, with evidence of… Read more »