Insert Knob A in Hole B

Short story by Asimov. Published in 1957.
==First read==
===Format===
Part of my first read of Nightfall and other Stories. Less than 1 page, 41 lines per page. 298 words and 1849 charactersAnalysed version available online with Notepad++.. That makes an average of 6.2 characters per word. 1 'standard' page (350 5.5-character words per page).
===Journal===
Only wrote and rated the compilation as a whole.
==Ratings, awards, mentions and recommendations==
=Links and references=
Category:Works
Category:Short stories
Category:Science fiction short stories
Category:1950s short stories