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The human body is a marvel of intricate complexity, comprising an estimated 37 trillion cells that work in perfect harmony to sustain life. This astonishing entity is comprised of approximately 60% water, which plays a vital role in regulating bodily functions such as temperature and metabolism. The human brain, the most complex organ within the human form, weighs approximately 1.4 kilograms and consumes around 20% of the body's total energy expenditure.