Rocket engine (1926)
Physicist professor Robert Godard was an avid fan of Wells’ War of the Worlds. Being engaged in science, he devoted a huge part of his time to the study of combustible rocket fuel. He believed that someday real flights into space, described in his favorite work, will become available to mankind. Robert Godard launched his first rocket in 1926, and it was powered by a liquid propellant rocket engine. Then the rocket was able to rise only a little over six meters, however, this marked the beginning of the global exploration of space by mankind. Continue reading
We all often see various advertisements for organizations that provide assistance to people with disabilities, orphans and animals. On the streets, promoters are handing out leaflets calling for help to put in order the dying nature, posters flashing in metro cars with the words “Let’s save children with rare diseases”. It so happened in our society that most people do not trust charitable foundations or simply do not believe in their honest activities. Continue reading
Concrete production is a demanded business: the volume of construction is constantly increasing, and the demand for materials is also growing. Concrete is in demand in housing construction, road construction and industrial construction. This is the main raw material that is needed to create reinforced concrete structures and elements.
The production of concrete requires large investments, but raw materials and additives to improve the quality are available, and the technology does not require special knowledge. Continue reading