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The human body is a complex machine, with intricate systems that work together to keep us alive and functioning properly. The cardiovascular system, for example, pumps blood throughout our bodies, supplying oxygen and nutrients to our cells. Meanwhile, the nervous system transmits signals between our brain and the rest of our body, allowing us to think, move, and react to the world around us. The human heart beats approximately 3 billion times in a person's lifetime, pumping over 1.5 million barrels of blood - enough to fill 200 train tank cars. The heart pumps blood at a rate of about 2,000 gallons per day, which is enough to fill a small swimming pool. Our eyes are capable of processing 36,000 bits of information every hour, and our brains can store up to 100 terabytes of information - the equivalent of about 20 million hours of music. Despite its many wonders, the human body has a limited lifespan and is susceptible to disease and injury. However, by taking care of ourselves through regular exercise, healthy eating, and adequate sleep, we can help maintain our bodies' optimal functioning and prevent many common health problems.