The human body performs miracles every day. Your brain generates enough electricity to power a light bulb. Your stomach’s acid can dissolve metal. Every second, your body produces 25 million new cells. That means in 15 seconds, you’ll make more cells than the entire population of the USA. Octopuses have three hearts and blue blood. A shrimp’s heart is located in its head. Sloths can hold their breath longer than dolphins. Cows have best friends and get stressed when separated. Frogs can freeze without dying and thaw back to life in spring.