<Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (March 2014) </Td> </Tr> <P> The head contains sensory organs: two eyes, two ears, a nose and inside the mouth a tongue . It also houses the brain . </P> <P> For humans, the head and particularly the face are the main distinguishing feature between different people, due to their easily discernible features such as hair and eye color, nose, eye and mouth shapes and wrinkles . The human head typically weighs between 5 and 11 pounds (2.3 and 5.0 kg). Human faces are easily differentiable to us due to our brains' predispositions toward discriminating human facial forms . When observing a relatively unfamiliar species, all faces seem nearly identical, and human infants are biologically programmed to recognize subtle differences in anthropic facial features . </P> <P> People who are more intelligent than normal are sometimes depicted in cartoons as having bigger heads, as a way of notionally indicating that they have a "larger brain"; in science fiction, an extraterrestrial having a big head is often symbolic of high intelligence . Outside this symbolic depiction, however, advances in neurobiology have shown that the functional diversity of the brain means that a difference in overall brain size is only slighty to moderately correlated to differences in overall intelligence between two humans . </P>

What is the average weight of human head