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• The nervous system is interconnected: the left side of the brain controls the right side of the body, and vice versa. • There is a neural cross-wiring that connects the right and left sides of the body. • Evolution has kept this device, perhaps for a benefit, but biologists don't know what it is. • Mathematical approach to the problem shows that cross wiring is topologically the easiest way to avoid errors. • The mapping of three-dimensional space onto a two-dimensional plane in the brain explains the interconnection of the nervous system. • Geometric features arise due to changes in the geometry of the perceived world. • To maintain non-overlapping connections, the brain would need to constantly flip the axis of its body maps. • There is little biological research on this subject, but the scientific method can help solve perennial biological puzzles.