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The human brain is a highly complex and mysterious organ, capable of performing an astonishing array of functions. It is responsible for controlling our thoughts, emotions, and actions, and is comprised of billions of specialized cells called neurons. These neurons are connected by trillions of synapses, which allow them to communicate with one another and transmit information throughout the body. The human brain is also home to a vast network of blood vessels, which supply it with oxygen and nutrients that are necessary for its proper functioning.