13 Mysterious Details on Everyday Objects Explained
We’re so used to seeing certain everyday objects that we often ignore their little but important details. Yet, some of the most ingenious ideas are often hidden right in plain sight. If you look closely at a tram’s overhead lines, you’ll see that its contact wires zigzag back and forth instead of going in a straight line. As the tram moves, the arm-like structure called a pantograph attached to its roof slides along the wire, and it wears down evenly.