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The human brain is composed of 3 parts. The neocortex which is primarily responsible for thinking or rationalizing. The second part is the mid-brain or limbic brain; it's known as the emotional or feeling brain. The third part is the reptilian brain which is responsible for our "fight or flight" response. 

There are approximately 100,000 neural pathways, or fibers in the brain.

After the brain, the eyes are the most complex organ, with a direct connection to the brain.

Gazespotting - Where you look does affect how you feel.