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"I love that computer science has made mathematics into something like an experimental science. I was never all that good at proving things, but I love doing computer experiments."
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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 (BACK ON!) ( 7 ) | RSS/XML | Blog This | Additional
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