Brain Function Human brain has two sides, if can open the skull and look inside, the first thing to notice is the brain size. Human brain is 1/45th of the body weight, dinosaur has the smallest brain 1/100000th and marmosets have the largest brain 1/25th. Each brain has different ways of looking at the world. Human brain can be divided in to two main parts left and right brain. When reading some article or some other thing, the two sides of the brain must do completely different things. The more integrate those two sides, the more integrated we become as people. Integration not only increases our ability to solve problems more creatively, but to control physical ma