Complexity: Brain and Genes
What about complexity? In this regard, humans rank at the very top end of universal scales.
The human brain has a weight of about 3 pounds. It consists of about 100 billion nerve cells (1011), and each nerve cell connects to multiple other nerve cells with an average of 1000 to 10,000 synaptic connections. This means that there are about 100 trillion synaptic connections, which can be expressed in exponential terms as 1014.
As a network, the brain is the most complex structure we can find (so far) in the universe. We don't know much about the structural rules that govern extremely complex objects like our brains.
Even though the brain is integral to who I am, I am completely unaware of its operation. There is no material self-awareness in the physical object of my brain; there is only the consciousness that holds the information I am writing down right now. Modern science still knows very little about the brain and its interactions with the human mind as we experience it. There exists a real barrier, called the mind-body problem. Creating a detailed model and a deeper understanding of the brain is a truly daunting task, more difficult than mapping the physical universe.
What about the genome? It has about six billion bits of information, which is in the order of magnitude of 1010 bits. The genome is therefore substantially smaller, or less complex, than the mature human brain. From the aspect of pure information content, it is estimated that there is about a billion (109) times more information in the brain than in the human genome. The difference in information content originates from the self-organization of the brain as it interacts with the person's environment over the course of a lifetime. Learning adds a lot of information to our minds, and the brain grows and networks itself as it matures throughout the lifespan.