assimilate inside one hour.

(d) The vocabulary is extremely small, less than 1,000 roots, mostly
common to every Aryan tongue, being sufficient for all ordinary purposes
of language.

This is due to the marvelously ingenious system of word building, which
enables anyone to derive from a dozen to one hundred and more words from
every root, there being to this derivation no limit but that of common
sense.

Of course, the vocabulary for science and technology is considerably
larger, but equally flexible.

(e) There are no troublesome genders; sex is expressed by the insertion
of "in" before the "o" ending of nouns, and of course only in the case
of animate creation. For instance, "viro" is man, "virino" woman,
"frato" brother, "fratino" sister, "kuzo" male cousin, "kuzino" female
cousin, etc. And here Esperanto has over all other languages not only
the signal advantage that there are no irregularities, but the far
more important advantage that the scheme is applicable to all cases.
For instance, although we have in English from 30 to 40 different
ways of forming the feminine such as father, mother; brother, sister;
uncle, aunt; bull, cow; stallion, mare; fox, vixen; etc., yet in most
cases we possess no decent or sensible way to indicate the sex of the
individuals; as, for instance, in the cases of teacher, doctor, friend,
cousin, neighbor, witness, elephant, camel, goat, typist, stenographer,
companion, president, chairman, etc.

Last, but not least, every word parses itself by its distinctive ending.