The Mystery of the Cyber Teachers (short story)

Peardrop was the fourth short story in the The Lucy Wilson Mysteries series' free online anthology The Lucy Wilson Collection: School Children, all of whose entries were written by schoolchildren. It was published anonymously.

Plot
At school, during a maths lesson, Lucy Wilson progressively realizes that her boring teacher Mr Johnson appears to have been replaced with a much more competent duplicate of himself. Why does no one seem to notice, let alone care about, this unusual behaviour?

Characters

 * Lucy Wilson
 * Hobo Kostinen
 * Mr Johnson
 * Cyber Teacher Mr Johnson

Worldbuilding

 * Lucy quips that she is not telepathic.
 * The false Mr Johnson performs a mathematics-themed rap.
 * The Cyber Teacher "mechanically jigs" Pythagoras's theorem.

Continuity

 * Nick Wilson is off at university. (PROSE: Avatars of the Intelligence)