.Do you know how margins was added to the books you use.I guess not. Back then when there was no safer way of keeping books from where rats wouldn't get access to it. And when the rats gain access to the books they chew just the edges of the books thereby chewing the writings on the edges of the books. Then books margins where added to books to prevent rats from chewing the writings along with the books. With this system important information wasn't lost to rodents.
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Not all the time you should keep on struggling with the screwdriver in a tight corner were your hands will not be comfortable to hold the screw and the driver, sometimes screwdriver are meant to work together with ranches it solves the problem of struggling with yourself when working in tight corners, all you have to do is just put the spanner and the screwdrivegr together as you see above then you good too go.
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