[Chekov takes no offense. Most people don't have any idea what he's going on about; Sophie gets points just for feigning interest.]

Pre-radio? May I ask what year?

[He takes the papers and schematics back--they're clearly not of interest--and then turns to the biggest frankenmachine in the living room.]

This is--or I hope it to be--a computer and a replicator. [helpfully] A replicator makes things out of particles in the air.