The Useless Digest A Free Weekly dose of Facts, Quotes, History and more - direct to your inbox. This question is definitely not a no-brainer. One theory centers on the two halves of the brain, i.e. the left half and the right half, each of which functions differently.
Medical science believes that the left half of the brain predominates over the right half.
The stem of this theory is the fact that nerves from the brain cross over at neck-level to the opposite side of the body, and nerves from the other side of the brain reciprocate. The end result is that the opposite sides of the body are supplied by the opposite sides of the brain. The predominant left half of the brain, which graciously supplies the right half of the body, theoretically renders it more skillful in reading, writing, speaking, and working, and makes most people right-handed. Theory number two trickles down to the asymmetrical nature of the body. Examples of the asymmetry, which flows from head to toe, are that the right side of our faces differs slightly from the left, that our legs differ in strength, or that our feet vary in size.