Factoid: Ion Channels: The cells on opposite sides of a symmetry (in left and right hand for instance) are thought to synchronize by Ion Channels through the body cells. Certain cells literally supercharge their Ion Channels: also called "synapses" in neural cells. The brain.

So your brain is really just an evolutionary exercise and keeping left and right approximately balanced. The same ion channels work for symmetry in leafy vegetables and, indeed, worms. So your brain is really just a mutant leaf. Who knew!