Life pits the order and intricacy of biology against the ceaseless chaos of physics. The second law of thermodynamics, or the thermodynamic arrow of time, states that any natural system will always ...

Between predator-prey and competitive relationships, it may seem that organisms are alone in the world, fighting to survive and reproduce. But many organisms have evolved cooperative strategies for ...

Life pits the order and intricacy of biology against the ceaseless chaos of physics. The second law of thermodynamics, or the thermodynamic arrow of time, states that any natural system will always ...

Skeletons of the early horse-relative Eohippus (left) and modern Equus (right). From Animals of the Past by Lucas. During the early 20th century many biologists were considering a variety of ...

When a feline gets threatened, it engages in a suite of behaviors that seem to have the purpose of facilitating its own survival. A cat will growl angrily. It will arch its back. And even the fur on ...