Quora is one of the best social networks in terms of questions and answers. Needless to say, there are numerous questions and answers about the English language. This is a particularly good example:

QUESTION

Has there ever existed a language that doesn’t have the word ‘no’?

ANSWER

Irish doesn’t have a word for “no.” All we have are negative forms of verbs.
For example, in Irish if you want to know if someone’s happy:
“An bhfuil áthas ort?”
“Níl.”
“Níl” does not mean “no”. It means “it isn’t”, as according to Irish grammar the question is: “Is happiness on you?”
There is no way to just say “No.”

Barry Purcell, on Quora