Paper × 841 mm). A1 is half the size of a sheet of A0 (i.e., 594 mm × 841 mm), such that two sheets of A1 placed side by side are equal to one sheet of A0. A2 is half the size of a sheet of A1, and so forth. Common sizes used in the office and the home are A4 and A3 (A3 is the size of two A4 sheets). The density of paper ranges from for tissue paper to for some speciality paper. Printing paper is about . Paper may be classified into seven categories: Some paper types include:
How to be an Alien his knowledge of English society but an insight into the English language. It is in two parts. The first part, "How to be a General Alien", deals with such important English topics as the weather, tea, how not to be clever (since it is considered bad manners), how to compromise, and queueing (according to Mikes, the national passion). The chapter entitled "Sex" is in its entirety as follows. "Continental people have sex lives: the English have hot water bottles." The second part, "How to be a Particular Alien", describes particular occupations from Bloomsbury intellectual to bus driver, finishing with how