9. THE WORLD’S LARGEST LEMON BATTERY
In his 2016 lecture, materials chemist Saiful Islam demonstrated that you can create voltage with just a lemon, a copper nail, a magnesium strip and a few wires. He then took 1,013 lemons, cut them all in half, connected them together, and created the world’s largest lemon battery. It was so large that it had to be filmed in the antechamber outside the lecture theatre.
With adjudicators looking on, Islam set a Guinness World Record for the highest voltage produced by a fruit battery, clocking in at 1275.4V.