Perhaps some people here can help me.

I have a "discussion" going on in another place where some people are attempting to say that genetics has very little to play in how intelligent a person is.

They then go on to say that a person can learn "ANYTHING" providing they worked hard enough and long enough at it.

I tried to tell them that just as our physical body has limits to how much it can lift, so does our brain have mental limits as to how much and what it can know... yet they seem oblivious to this fact.