The Highest Elevation at Which People Live

In La Rinconada, Peru, the entire village of La Rinconada lives as high as those who make base camp on Mount Everest before attempting to scale its peak. When Spanish settlers first landed in La Rinconada, most lost their infant children shortly after birth because oxygen levels are half of what they are in comparison to most other places on Earth. The reason people stayed and continue to stay in La Rinconada is because of the gold which can be extracted from the nearby mountain ranges. La Rinconada is the absolute highest elevation at which humans can live, as anything considerably higher would cause organ failure which is often quick and difficult to detect by oneself resulting in death in many cases

The Reason Dark Spots Appear Upon Antique Documents

When brown color changes and dark spots appear on old documents and the pages of old books, these blemishes are referred to as “foxing”. The term “foxing” is based upon the term “ferrous oxide” borrowing the letter “f” in “ferrous” and the letters “ox” in “oxide”. Foxing occurs when paper becomes exposed to humidity and as part of the oxidation process when iron, copper, or other metallic substances within the pulp from which the paper was made are exposed to oxygen to form iron oxide which is rust