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The human body is a complex machine made up of over 60 trillion cells, each one working together to keep us alive and functioning properly. It's amazing how our bodies are able to heal themselves after an injury, or how they're able to adapt to changes in the environment. Our immune system fights off infections and diseases, while our digestive system breaks down food into nutrients that give us energy. But it's not just about physical health - our brains are also constantly working hard to process information, learn new things, and remember past experiences. From the moment we wake up in the morning until we go to bed at night, our bodies are always on the move, working tirelessly to keep us alive and healthy.