.The little and flat plastic or rubber disks on the cover of minerals and especially in your coke are there to preserve the gas in the carbonated drinks without it, the gas would escape and you would be drinking just ordinary liquid.
.Detachable headrests in cars or any vehicle are there so that they can be used to break the the windshield or the glass window when there is an emergency.
Like when the door is jammed and the car is sinking in a river or a swamp or an hostge trying to escape from it captors the above image illustrates how the headrest can be used break free and go out through the door. Put one of the iron rods in between the frame and the glass then pull backwards.
(6 out of 10)
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