Publikované 01. July 2013
Control of the fire was an important step in the development of human culture
and civilization. The use of fire by man began nearly 300,000 years ago.
Fascination with fire and wonder at its power remains.
Steel is an alloy made by combining iron and other elements, the most common
of these being carbon. Steel is one of the most common materials in the world,
with more than 1.3 billion tons produced annually. It is a major component in
buildings, infrastructure, tools, ships, automobiles, machines and also