It’s a small, fleshy creature, no more than an inch in length, with elongated spines and menacing pharyngeal teeth used to crush food. It lived in muddy shallow waters some hundreds of millions of ...

At first glance, a glacier looks like a rather lifeless thing—a barren chunk of ice. But there’s much more than meets the eye: Glaciers are home to a host of tiny organisms that make up a flourishing ...