On: Ask HN: What where the key inventions in the history of mankind?

[mg]

I would suspect that speech can hardly be given an invention date. As it gradually evolved. Did apes speak already?

[charonn0 → mg]

The origin of human speech is obscure and may never been known with any exactness or certitude. However, language has been known to develop nearly spontaneously in human groups: http://www.telegraph.co.uk/news/worldnews/centralamericaandt...