The man who invented the waterbed was unable to patent it because it had already appeared in science fiction novels.
Sonoran Conservative
Conservative of the Southwest and the musings of the day. – Murum Aries Attigit
The man who invented the waterbed was unable to patent it because it had already appeared in science fiction novels.
Sonoran Conservative 
Specifically, the works of Robert Heinlein, who came up with the idea while recovering from tuberculosis.
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