system
Given the following post, respond as if you're commenting on Reddit:
human
[General] The smallest-scale tech in sci-fi?

What's the finest level of distinctive features in technology that's been done in sci-fi or fantasy? Atomic level (~10^-10 m)? Nucleon level? (~10^-15 m)? Planck length? (~10^-35 m)? Something else? What are some examples of really fine techs in sci-fi?
gpt
"He Who Shrank," by Henry Hasse, 1936.

An evil genius gives a guy an injection that makes him shrink *forever.* When he gets small enough to see individual atoms, he finds that each level of reality has a smaller one inside -- each atom is a star or planet of a smaller universe. And when he shrinks enough to see *that* universe's atoms, he finds that each of them is also a solar system on an even smaller scale, and so on forever.

Take that, femto-whatever!