"Sutton's large-scale illustrations help children to visualize microorganisms and processes that are too small to see. . . . A handsome and rewarding picture book." -- Booklist (starred review) All around the world--in the sea, in the soil, in the air, and in your body--there are living things so tiny that millions could fit on an ant's antenna. They're busy doing all sorts of things, from giving you a cold and making yogurt to eroding mountains and helping to make the air we breathe.