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Are you the predator, or the prey? Here is the latest news and findings on creatures that hunt, kill, and make Shark Week the best week.

Here's where you're find the latest poop on poop.

It's real. It's happening. It's accelerating. And it's our fault.

Marijuana is an age-old drug made from parts of the Cannabis plant.

Everyone needs sleep, but many of us don't get enough.

The human heart is a vital organ that pumps blood through the body.

The reproductive system is a collection of organs found in both sexes that work together for the purpose of producing offspring.

Caffeine is perhaps the world's most popular mood-altering drug, found commonly in coffee and tea.

Vaccines help protect people from diseases.

Autism is a developmental disorder that affects a person's ability to communicate and interact with others.

The Cretaceous, the last and longest period of the dinosaur age, lasted from about 145.5 million to about 65.5 million years ago.

During the Viking Age, which lasted from about A.D. 800 to 1066, Scandinavian seafarers raided foreign lands, began new settlements and traded goods such as furs, reindeer antlers and seal fat.

Photosynthesis allows plants, algae and certain bacteria to turn sunlight into chemical energy.

Deforestation happens when forests are permanently destroyed.

The lymphatic system helps to defend the body against infections.

Ancient Egypt is famous for its pyramids, pharaohs and mummies, but archaeologists are still learning about this sophisticated society.

Mummies provide a window into the traditions and rituals practiced by ancient cultures.

Here are all the latest discoveries and developments to help you keep up with the fascinating world of chemical elements.

Personality — it's what makes you, you. But what traits make up a person's personality? Can personality be changed? To keep up with research on personality, check here for the latest news.