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The air up that high is so thin that the air pressure on the lower surface of the rotor blades isn`t that much different than the air pressure on the top - therefore the amount of lift the helicopter gains is minimal.
The Eurocopter that peformed the stunt has a fairly new design for the shape and size of her rotorblades, plus newer, more powerful engines.
Jet aircraft have been doing it for years; now helicopters can do it as well. 8-)
It`s still an incredible achievement if you were to go climb Everest the old-fashioned way; additional kudos to you if you do it without oxygen tanks (has been done before, but is more impressive). My congratulations to anyone who has done it, and to anyone who does it in future!
Kind of makes it less special.