“Pixies,” I said.
“Pixies?!” My nephew spun towards me. He’s used to my scientific answers: refraction makes the sky blue, bites itch because of histamines, etc. When he asked how the dispenser gives him soap, he was probably expecting light beams or heat sensors.
“Pixies,” I said. “They sit in the machine and whenever they see a hand coming towards them, they panic! The Watching Pixie calls up to the Defensive Pixies and they fire soap!”
His eyes lit up. “But soap isn’t a weapon!”
“Makes the hand go away, doesn’t it?”
A full minute later: “Is soap pixie poop?!”
If you enjoyed the science in this week’s Friday Fiction, check out this old Inspiration Mondays story about how fridge lights work.