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"I think that self-limitation is the major limiting factor for most people in the world."
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Here's a handy invention that would have been impossible in the 1940's (when the story was written) but is eminently manufacturable in the 21st century. Not satisfied with technologies that were merely forty years ahead of his time, Heinlein skipped right over the entire cell phone era.
Hopefully, it uses a very low level of radiation in transmitting back to the caller.
As far as I know, the first person to suggest this idea was sf's own Hugo Gernsback, who filed for a patent on an "osophone" in 1923; the patent was granted in 1924.
In 2000, Digital Angel created a subdermal device that "can be used to monitor a person's key body functions -- such as temperature and pulse -- and transmit that data wirelessly, on a real time basis, along with the accurate location of the person, to a web-enabled ground station or monitoring facility," according to their press release. Comment/Join this discussion ( 7 ) | RSS/XML | Blog This | Additional
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Science Fiction
Timeline
Bone-Building Drug Evenity Approved
'Compounds devised by the biochemists for the rapid building of bone...'
Secret Kill Switch Found In Yutong Buses
'The car faltered as the external command came to brake...'
Inmotion Electric Unicycle In Combat
'It is about the size and shape of a kitchen stool, gyro-stabilized...'
Congress Considers Automatic Emergency Braking, One Hundred Years Too Late
'The greatest problem of all was the elimination of the human element of braking together with its inevitable time lag.'
The Desert Ship Sailed In Imagination
'Across the ancient sea floor a dozen tall, blue-sailed Martian sand ships floated, like blue smoke.'
Could Crystal Batteries Generate Power For Centuries?
'Power could be compressed thus into an inch-square cube of what looked like blue-white ice'
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