I'm one of the naysayers, and I'm one of the lefties. So, I've come here to parade my bucket of no painted red. But, asked the purely intellectual question "is any element of intelligence heritable" obviously I'm going to say yes.
Yes. It's heritable. What do you want to do about it? How much do you want to screw things up, acting on it?
Yes. It's heritable. What do you want to do about it? How much do you want to screw things up, acting on it?