We had no input in the "nature" part of their cognative development but we are working hard on the nurture side.
My wife takes the time to expose them to new things and then explain it to them.
I am not sure if I said this already so forgive me if I have - after the swim with the whale sharks he told Mrs Oz that the whale shark did not have a very good mommy because she did not make him brush his teeth and now he doesn't have any.
I'm getting a mental image of a whaleshark brushing his teeth
Sent you a pm with my two cents... (In Euros, so that's about 2,7 Merkan or 2,9 Kangaroo. About 1,2 Pesos.)