The document discusses communication between the left and right hemispheres of the brain. The corpus callosum connects the two hemispheres and allows for processing of sensory, motor, and cognitive information. It also discusses how bilateral manipulation uses both sides of the body to accomplish tasks, rather than just the dominant side. Differences are noted between male and female brains, such as gray and white matter composition and cognitive strengths, but IQ is virtually the same on average between sexes.