Some harlequin frogs have lost their poison—and their ability to defend themselves. Scientists are on the case.

This small, cute looking creature is one of the most dangerous animals in the ocean. It hides on shallow reefs, blending into its surroundings. While snorkeling or walking near the shore, you might ...

From naive tourists taking selfies in a Chernobyl claw surrounded by deadly levels of radiation, to people casually holding ...