Transcription: It was common practice for farmers near my laboratory to harvest lemons using a copper lance. I decided to help by equipping the workers' mammoths with some lightweight zinc rods which I had left over from an earlier experiment. I was surprised to see both workers and mammoths seized by invisible forces each time they speared a lemon. Although the farmers were shocked by this turn of events, I could foresee some useful applications for this new source of power.