Shalom Chaim:
Please comment:
(1) It is generally accepted that a person is considered intellectually disabled with an IQ is below 80. Even more so, an IQ score of 67 is in the "mentally retarded" range. Unsurprisingly, nearly all sub-Saharan african countries have a national average IQ range between 60 and 70 and this. I don't see how there can't be at least a partial genetic component to this problem.
(2) Some of the best laughs I've ever had where when you told about your interactions with Brazillia and Cleopatra Jefferson - m'-m'-m'. These stories are all-time classics. I am almost afraid to ask but have you had any recent interactions with such primates?
All the best