Cable Cord Cylinders
Check your cord and you will find a cylinder-like lump near the end of it. These things are called ferrite cores. They have magnetic iron oxide, which helps prevent high-frequency electromagnetic interference. Stay close to a speaker when you make a call and there will be weird noises. These things prevent those!
Apple Power Cord Wings
MacBook power cords have wings, but why? It turns out that you can use them if you want to keep your things organized. Flip them up and wrap the cord if you do not want to accidentally trip anyone else! If you have a Type A personality, you will probably appreciate this feature.