Most of us have probably used a 9-volt battery. They power small household items such as clocks, smoke detectors, and toys.

Electric eels are remarkable, snake-like fish with the power to deliver electric shocks to defend themselves, hunt, navigate and even communicate with one another. But how does their amazing ability ...

Japanese eels have found an ingenious way to escape a fish's stomach after being swallowed — backing up the digestive tract ...