The orange roughy may be among the oldest living deep-sea fish in the world, with a lifespan of up to 250 years. But bottom ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Some types of sea ...

Many of the fish lurking in the depths of the ocean resemble the alien villains of horror films, with gargantuan teeth, glow-in-the-dark bodies and bulging eyeballs. But why do these fish have such ...