Cylinders On Cable Cords
Many of us have wondered what the cylinder-like shape found at the end of cable cords is really for. They are commonly called chokes or ferrite cores which contain magnetic oxides that are useful in preventing high-frequency electromagnetic interference. Interestingly, having these around will allow you to be notified when a smartphone is nearby, as you would begin hearing constant noise as they come into contact with each other. So, the next time you happen to see a few chokes, at least you will understand their real purpose and can tell a friend about it as well.

Cylinders On Cable Cords
Apple Cord With Wings
For those who own a MacBook or have come in contact with one, you might be wondering what the wings found on the power cord (the ones that you can pull up) are for. Finding out their true purpose might be a disappointment for many, but others will find it pretty useful. The wings are there to help prevent the cables from becoming tangled while the device is charging. After all, staying clear of this kind of mess is always a good thing.

Apple Cord With Wings