They did not have the benefit of cheap, off the shelf, mass produced batteries. Bronze is a relatively hard alloy of copper and tin, better suited for the purpose than the much softer copper enabling improved durability of the weapons and the ability to hold a cutting edge.
For many years the telegraph, and later the telephone, industries were the only consumers of batteries in modest volumes and it wasn't until the twentieth century that new applications created the demand that made the battery a commodity item. The use of bronze for tools and weapons gradually spread to the rest of the World until it was eventually superceded by the much harder iron.
“Unacknowledged” will focus on the historic files of the Disclosure Project and how UFO secrecy has been ruthlessly enforced – and why.
The best evidence for Extraterrestrial contact, dating back decades, will be presented with direct topsecret witness testimony, documents and UFO footage.
Background We think of a battery today as a source of portable power, but it is no exaggeration to say that the battery is one of the most important inventions in the history of mankind.
Volta's pile was at first a technical curiosity but this new electrochemical phenomenon very quickly opened the door to new branches of both physics and chemistry and a myriad of discoveries, inventions and applications.
Greer MD Following the most successful crowd-funded documentary in history, Sirius, Dr.However, under different climate states during the past few millennia the water flux was greater than now; this leads to great uncertainty in estimations of how much of the current water flow is renewable versus fossil.This study of the aquifers in the Calama Valley is motivated by the challenge of sustainable long-term management of the Loa coupled with the natural-human resource system.Many archeologists believe South America's early settlers traveled from the west coast inland toward the Andean Mountains, avoiding the desert's dry center by walking along its wetter edges.But the new findings suggest the Atacama's ancient lakes could have provided another path through the desert, and possibly even homes for South American settlers.