Your amazing human body comes complete with a full set of systems that work together to make you. How Your Body Works introduces the marvels of the human body and unlocks some basic mysteries, such as why blood is red, why you couldn't hear without tiny hairs, why parts of your bones look like sponge, why your brain is even better than the fastest computer, why your lungs could cover a tennis court, and why your small intestine is actually as long as a bus. A clear, straightforward style captures and holds the interest of young readers to instill a lifetime of wonder. Your amazing senses send constant reports to your brain. You don't have to think about seeing the blue skies above, hearing the blast of a train's whistle, smelling the blooming flower, tasting your favorite ice cream, or feeling the summer breeze on your skin--it all happens automatically as your sensory system brings the world to you.