I will also add that it wasn't until the 19th century that we understood and could define what fire is, but we invented it many millennia before that. We made p

I will also add that it wasn't until the 19th century that we understood and could define what fire is, but we invented it many millennia before that. We made productive use of it for thousands of years having no idea what it exactly was, but sometimes it escaped our control. Sometimes it still does.