Climbers get stranded on mountains with frightening regularity lately. Their way down may be blocked by avalanches, landslides, or other damage to the route. So, if people can't escape from mountain tops on foot, why not rescue them with the help of helicopters? After all, these machines can land anywhere, right?

It turns out that there’s a serious reason why choppers don't fly all the way to the top of high mountains like Everest. Of course, there are special helicopters that can fly way higher than regular ones. They not only have larger blades and extremely powerful engines but they also cost a fortune as you may guess. So what about ordinary helicopters?

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