The Art and Science of Learning Languages
More people go to more different foreign countries than ever before, and there has never before been such a widespread practical need to know foreign languages.
For those whose mother tongue is not English, that is obviously the most generally useful language to learn. And the greater the number of people who know English, the more useful English becomes. It is invaluable to travellers of all kinds, and to those who want to send letters or faxes, telephone or radio messages, across the