Edit = A lot of people think this movie was based on an Isaac Asimov novel. The truth is that Asimov did a novelization of a script written by Harry Kleiner, based on a story by Otto Klement and Jerome Bixby.
The novel let Asimov flex his muscles and come up with all kinds of ways the miniaturization process could have worked.
[off topic]
Old school special effects and Raquel Welch in a skin tight wet suit.
https://youtu.be/U3ZMor5UFyY
Edit = A lot of people think this movie was based on an Isaac Asimov novel. The truth is that Asimov did a novelization of a script written by Harry Kleiner, based on a story by Otto Klement and Jerome Bixby.
The novel let Asimov flex his muscles and come up with all kinds of ways the miniaturization process could have worked.
Loved that movie as a kid.