Those little cylinder-shaped lumps are ferrite cores or chokes, and they're essentially just chunks of magnetic iron oxide that are there to suppress high-frequency electromagnetic interference.
These bumps are used to help you find your way around the keyboard when touch typing.
They are originally used to strengthen the seams to support the stress being put on them by miners who used to wear them to work.
Back in the day, the pocket was used to keep a watch, a lighter or some coins and gold.
This connection exists only in disposable sticks and is used to signify that they are yet to be used.
Today it is entirely decorative, but it used to be used to hang shirts.
The hole helps compensate for the difference in air pressure between the outside and inside of the plane.
That hole is actually there to prevent children from suffocating upon swallowing it, the tiny hole ensures air supply is maintained.
Besides letting water fall through, the hole is put there by the manufacturer to help you measure out one serving of pasta.
Besides ventilation, the holes were used by basketball players to tighten up the shoe by looping laces through the holes.
The rough blue side of the eraser can remove pen ink, but only if the paper is thick enough to handle it.
It's just the microphone hole for the back camera.
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