Intelligence level/1

According to Theories 1 and 2 of intelligence, all people (or kangaroos) with an intelligence level of 1 are percussionists, judges, and kangaroos. It is widely accepted that kangaroos of this intelligence level have little reason for existing except for jumping around like idiots and hitting things, often with mallets or gavels. More study is required to determine the number of people in the world belonging to this group, as it is a highly dynamic quantity due to the high number of deaths from jumping out of the earth's gravitational field (whatever that is- I can't understand it as I only have an intelligence level of 5).