>>12755599There are some factors that contribute to the development of intelligence in a child, namely getting a healthy and balanced diet during early development, as well as a decent education that can challenge the child. It is obvious that in wealthy countries this will be easier to achieve.
IQ is bullshit, tho. I don't believe that being able of spotting some patterns in some boxes with some drawings will actually correlate to intelligence. Once you do like 20 a day, you'll start seeing the patterns and get an IQ of 240 in less than a month