The evolution of flight in insects has seen them take to the skies ... Zemu Glacier in the eastern Himalayas at an eye-watering altitude of 5,791 meters (19,000 feet). Were they the mountaineering ...

But before you consider sneaking off with your partner for a rendezvous among the clouds, let's dive into the legality of this high-altitude romance. TL;DR: Quick Takeaways on the Mile High ...

Browse a gallery of the U.S. Air Force's high-altitude balloon experiments and the researchers, scientists, and test pilots who made them possible.

As you can see in the accompanying video, the Kittinger jumps were part of an Air Force project to test multi-stage parachutes made for high-altitude ejections. This was dangerous testing.