Indonesians have an average IQ of 86. Their memories are excellent but their cognitive abilities are lacking, which is similar to the Aboriginals of Australia who have an IQ lower than an Indonesian. I can attest to this as I've worked with Indonesians for over 3 years. Their ability to understand something is very limited and they get very defensive when you point out the obvious flaws of their argument. The ones who speak and write English (which they do both rather poorly) are by far the worst. They refuse assistance to correct their mistakes, get very defensive, and bizarrely, attempt to correct your English grammar! I've worked with dozens of people from around the world and Indonesians have easily earned the world title of 'The Arrogance of Ignorance.'. Their ignorance is something to behold and suspect it will not change anytime soon. Genetics does that.