What is the name of this short story?

Science Fiction, or Speculative Fiction if you prefer. Fantasy too. Asimov, Bradbury, Clarke, Dick, Heinlein and other SF books. SF movies and TV shows. Fantasy stuff like Tolkien and Game of Thrones. Laser guns, space ships, and time travel. etc. Star Trek, Battlestar, Star Wars, etc.

Dad's Curta, my Dataman, Kerry and R600

A community for those who appreciate high quality writing utensils. r/mechanicalpencils