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Special balloons and fixed-wing aircraft can act as long-endurance aerial platforms for observation and communication. Known as high-altitude platform stations/systems (HAPS), they fly above most planes but below satellites. Weather, scientific and military balloons are similar; they also ascend to great heights but do not necessarily stay there for a long time. by Dr David Maddison

A short time ago, we explained why electrically propelled aircraft are so much more difficult to build than their road roving four and two-wheeled counte...