Upvoted (and came to say the same)!

The interesting thing about fire is that it is way back in human history, like, AFAIU, before our hominid species even evolved. So it's likely intertwined with very biological being.

Another similar invention is likely language. Once the evolutionary pieces were there to get language to the ability of syntax, whoever were the people that riffed on communicating with sounds to the point of making up words and making sentences etc, they invented some ridiculously awesome shit. Like there was probably the first sharing between people of a pun, joke, or first abstraction or conceptual musing. The first argument where one person was more convincing. The first person who was naturally good at speaking and impressed others with it.