CopterPack Is Robert Heinlein's 1954 Copter Harness
CopterPack is an electric backpack helicopter with a self-levelling autopilot. Take a look at a test flight of this device.
Since noting more is known, I might as well tell you about what Robert Heinlein was thinking almost seventy years ago in The Star Beast
They were half way home when a single flyer, hopping free in a copter harness, approached the little parade. The flier ignored the red warning light stabbing out from the police chief's car and slanted straight down at the huge star beast. John Thomas thought that he recognized that he recognized Betty's slapdash style...
(Read more about Heinlein's copter harness)
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A System To Defeat AI Face Recognition
'...points and patches of light... sliding all over their faces in a programmed manner that had been designed to foil facial recognition systems.'