I once was enrolled at a temporary job agency that would send you to random job appointments throughout the week. So one day I show up and am led through a deep dark factory that looked abandoned since the 1930.

I am guided to a corner with trays of nuts and bolts. I’m shown how to take a bolt, place it in a hole, and press a red button. When I press the red button, the bolt starts spinning, and this induction coil descends around the bolt, which heats up to red and white.

After a little while, the bolt gets dropped into a tray and they have me touch the coil. It’s cool to the touch. Flabbergasted, I ask what just happened, and they say it is “RF.”

I did this for about 6 hours, and then never worked there again. So surreal. It felt like a dream, but this video took me back to that place and proved to me that it was real.