28 Responses to The Real Origin of Viking Raids. 1  Well done! 2  Thank you for this article. 3  The shutting of the ancient trade routes to Rome and the East by the Holy Roman Empire was the principle reason that the Rus trade routes down the Volga were established. 4  Pingback: Daily Stuff 5-20-13 MjÃ¶lnir | Ancient Light's Daily Stuff.
By Anne Marie Helmenstine, Ph.D. Gunpowder or black powder is of great historical importance in chemistry. Although it can explode, its principal use is as a propellant. Gunpowder was invented by Chinese alchemists in the 9th century.Originally, it was made by mixing elemental sulfur, charcoal, and saltpeter (potassium nitrate).y Anne Marie Helmenstine, Ph.D. Gunpowder or black powder is of great historical importance in chemistry. Although it can explode, its principal use is as a propellant. Gunpowder was invented by Chinese alchemists in the 9th century.
This led to the invention of the steamboat and the locomotive. Because of the Industrial Revolution, there was a tremendous incrtease in the demand for coal, iron and steel. Although the use of steam power marked a tremendous stride forward, scientists and inventors still were not satisfied.his led to the invention of the steamboat and the locomotive. Because of the Industrial Revolution, there was a tremendous incrtease in the demand for coal, iron and steel. Although the use of steam power marked a tremendous stride forward, scientists and inventors still were not satisfied.