- Etymology reveals historical shifts in meaning, such as the Farsi word 'div' changing from 'god' to 'demon' due to ancient Zoroastrian religious schism.
- Cognates across Indo-European languages, like Farsi 'abru' (eyebrow) and English 'eyebrow', or 'lox' (salmon) preserved for millennia, highlight deep linguistic connections.
- Etymology helps historians trace ancient stories, like 'The Smith and the Devil', which may date back 6,000–7,000 years to Proto-Indo-European times.
- The word 'hello' shows how technology (the telephone) shaped modern language, shifting from expressions of surprise to a standard greeting in the late 19th century.
- Shared etymological roots underscore the interconnectedness of human history, bridging cultures often portrayed as separate, such as English and Persian.