Abstract
The prima facie linguistic evidence of everyday experience suggests that human beings are bewilderingly different from each other: adults frequently complain that it is impossible to master a foreign language; indeed, many communities despise languages or dialects other than their own; serious translation is often a painful struggle, producing results that are felt to be inadequate, even by the translators themselves; and even within our own communities, most of us have had the despairing experience of not understanding a single word of what someone else is saying