[schoper]

Except for deaf children, who seem to fall along the same IQ distribution as hearing children. And rich children seem to inherit their parents IQs instead of their Guatemalan nannies' IQs.

But feel free to go on believing that genes don't do anything. God just must have created everyone equal.

[clarkm]

That's actually not true -- congenital deaf children average almost a standard dev below average on IQ tests. However, your overall point still stands, as non-deaf children of deaf parents do just fine.

[ordinary]

Conversation need not be audio-based.