well, yeah, that's the point. If the kid had been dumb as a post he would probably have never felt the need to make it. Failing that, he either wouldn't have made it correctly, or would have been unable to ignite it.
But no, this kid knew how to manage all of that (and to hide it from his parents), and enough to set it off on a boulder. However, he didn't anticipate that the boulder would stay hot after the thermite is done. He was crawling onto the boulder to investigate when his parents found him and the smoking hole in the boulder...
Thus, IQ is arguably counter survival, and thus you can strengthen "growing up barely takes brains." to "Managing to grow up might be a weak indicator of lack of brains."
no subject
But no, this kid knew how to manage all of that (and to hide it from his parents), and enough to set it off on a boulder. However, he didn't anticipate that the boulder would stay hot after the thermite is done. He was crawling onto the boulder to investigate when his parents found him and the smoking hole in the boulder...
Thus, IQ is arguably counter survival, and thus you can strengthen "growing up barely takes brains." to "Managing to grow up might be a weak indicator of lack of brains."
Sorry for any confusion.