Zigzag Side On Bobby Pins
A bobby pin should be used with the wavy side facing the scalp. It looks cooler this way, and it ensures that the pin is secure and stays in place the whole day. The pin can hold onto hair more easily this way.
Cable Cord Cylinders
The cylinder-like lump found at the end of a cable cord contains magnetic iron oxide. The lump, which are known as a choke or ferrite core, helps block high-frequency electromagnetic interference. The cylinders on cable cords prevent interruptions like the weird noises which interrupt a call if your phone is a little too close to a speaker.