It's not clear if humans with ... a way to mimic those effects pharmaceutically. Unlike sleeping in a hypobaric chamber, as ...

This implies that human habitation existed in the area during that period. The site is located more than 11,000 feet above sea level. This means that the group was living in high-altitude mountains.

In the years since then, balloon flight technology has evolved from cloth balloons and open baskets to polyethylene balloons and metal pressurized gondolas that allow for high-altitude atmospheric ...