Why do our brains have two hemispheres?

​A very cool aspect of the brain is that it has two halves or ‘hemispheres’. Why? 
 
For one thing, each hemisphere is important for understanding the world on the opposite side of the body. For example, the right hemisphere moves the left side of the body. Interestingly, each hemisphere has an important role in language. The left hemisphere is crucial for communicating messages. The right hemisphere provides information about the quality of language (e.g., emotion). 
 
Certain people even live with their hemispheres separated from one another. People with this condition can show some interesting behavior. For example, imagine that a person is presented with two different objects to their left and right. A person may say that they see the object present on the right side. But they’ll draw the object present on their left-hand side with their right hand!
 
So, all together, this shows that our hemispheres are important and complex!