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The human brain is a highly complex and dynamic system that plays a crucial role in the human body's ability to think, learn, and behave. It is estimated that the average adult human brain contains approximately 86 billion neurons, which are connected by trillions of synapses. These connections enable the brain to process and store vast amounts of information, allowing humans to adapt to their environment and make decisions quickly. The brain's neural networks can be reorganized based on experience and learning, a process known as neuroplasticity. This ability allows humans to recover from injury or disease by relearning lost skills and abilities.