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At any given moment, the body is under quiet siege from bacteria, viruses, fungi, and other potential threats, most of which never cause a single sym

Food arrives as complex molecules the body can't use directly: starches, proteins, and fats too large to cross into the bloodstream. The **digestive

Every cell in the body needs a steady supply of oxygen to run cellular respiration efficiently, and e

The heart is a muscular pump roughly the size of a fist, and unlike skeletal muscle, it never needs conscious instruction to contract. Its rhythm

Pull your hand off a hot stove before you've even consciously registered the pain, and you've just experienced the nervous system operating faster th

Fly high enough over the planet and a pattern emerges: forests give way to grasslands, grasslands fade into deserts, and everything reorganizes again