BOSKOP

So I read an article in Discover magazine about the Boskop Hominids. They are Hominids that lived in southern Africa about 30,000 years ago. What was so special about this hominids was the size of their frontal lobe. It was much larger than ours, which would mean that they have higher IQ than we do. This begs the question; if these hominids were smarter than us, how come they are extinct and we still exist? Apparently, in the world of 30,000 years ago, smarter doesn't mean you survive.