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The human brain is a complex and highly developed organ that plays a crucial role in enabling humans to think, learn, communicate, and interact with their environment. It is estimated that the average adult human brain weighs around 3 pounds (1.4 kilograms) and contains approximately 100 billion neurons, each of which has thousands of synapses that enable it to connect and communicate with other neurons. The brain's neural networks are highly distributed and interconnected, allowing for the processing and integration of vast amounts of sensory information from various sources such as sight, sound, touch, taste, and smell. Through a process known as synaptic plasticity, the brain is able to reorganize itself in response to new experiences and learning, enabling humans to adapt and evolve over time.