These are the only tools you will need to start a campfire as Swedish YouTuber NorthSurvival demonstrates in the video below. While the above scenario will practically never happen in real life, the video is still a cool demonstration of how powerful and crazy science is. It’s a quick lesson in electrochemical reactions and circuitry! In the video, NorthSurvival sticks zinc nails and copper clips into a lemon. These act as “electrodes,” and when two electrodes of different kinds of metal are connected by a conductive material (lemon juice), they generate electricity. Touching the exposed ends of the wire with steel wool completes a circuit and generates a spark. This spark can then be used to ignite a piece of paper. While this isn’t a must-know survival hack, it’s still really cool to watch. Please SHARE this awesome demonstration if you love science!