Kind of like every other brain. Only slightly larger.
Yes, I did know that. And technically, Homo Sapiens haven't been around that long, but our predecessors were. Our brains are becoming more compact and our skulls are becoming more rounded as time goes on because our evolutionary needs dictate that we...
Wait.
It's still the 21st century, isn't it? I bet you guys never even found most of this stuff out yet.