Esperanto has around 2 million speakers and was invented in 1887 by Ludwig Lazarus Zamenhof.

The English language adds about 1,000 new words every year.

The Sapir-Whorf hypothesis proposes that language structure influences thought — strong and weak versions are debated.

Some languages mark grammatical distinctions English lacks — such as whether the speaker knows something directly or by report.

The phrase 'rule of thumb' has multiple possible origins — none involving domestic violence, despite popular myth.

The average educated English speaker knows 40,000–50,000 words but uses only 5,000–10,000 daily.

There are no true synonyms — words with similar meanings always differ in connotation, register, or use.

The word 'freelance' comes from medieval mercenaries who offered their 'free lances' for hire.

There is a word in Japanese, 'tsundoku', meaning buying books and never reading them.