Using Volcano Updrafts to Fly into Outer Space

This is a link to a Washington Post article about David Bigelow.  Bigelow pioneered a form of aviation technology using gliders to catch the violent updrafts from volcanoes to fly into the upper atmosphere/edge of outer space.  He died in one of his attempts but the technology is being reconsidered as an energy-efficient way to travel to the edges of the earth's atmosphere.