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Evening /n/iggas in disguise.
I highly recommend pic related, Oxford press Very Short Introductions book series.
WHY you ask
>Wide range of subjects: Geography. Stem cell. History of Russia. Muhammad. Plants.
These are some the subjects, there are 350+ and counting.
>Short intro to subject, easy to understand, good amount of detail, educate your silly ass.
>Booklet format, Just bigger about the size of 2 side by side iphone, and it's thin, and you can easily bring multiple books on multiple subjects.
>Easy read, nothing that taxes your mind.
>It's education and knowledge.