Whistled languages, like Silbo Gomero in the Canary Islands, encode full speech and are UNESCO Heritage.

The language with the most native speakers is Mandarin Chinese, followed by Spanish and English.

The oldest written language is Sumerian, dating to around 3200 BCE.

Urdu and Hindi are mutually intelligible in speech but written in completely different scripts.

The word 'set' has the most definitions in the English language — over 430 in some dictionaries.

Some languages have no word for 'left' and 'right' — speakers always use cardinal directions (north, south, east, west).

Wittgenstein argued that the limits of language are the limits of one's world.

The longest palindrome in English is a sentence: 'A man, a plan, a canal: Panama.'

Morse code is still in use in aviation and amateur radio today.