A humpback whale appeared to swallow then spit out a kayaker in a viral video filmed off the coast of Chile. But was he actually in any danger?

Darwin's theory of natural selection provides an explanation for why organisms develop traits that help them survive and reproduce.

In a case report published in the New England Journal of Medicine, doctors explain how they figured out the source of her fiery symptoms—worms burrowing into her brain. By this point, she was alert ...