Some animals can sleep with just half their brain at a time. Understanding this phenomenon can help us learn more about human ...

Dolphins can stay constantly alert for more than two weeks by sleeping with only half of their brains, researchers say. These findings suggest how dolphins can keep on the constant lookout for sharks, ...

Dolphins live in almost every ocean, except most tend to avoid the cold waters in the Arctic and around Antarctica. Some also live in rivers, including the Amazon River in South America and the Ganges ...