(This program is no longer available for online streaming.) From lobster claws and dog teeth to bee stings and snake fangs, every creature depends on a weapon. But some are armed to extremes that make ...

Of the over 100,000 people on the waitlist for an organ in the United States, 17 die every day. Now, the first pig-to-human heart transplant reveals some of the challenges of xenotransplantation.

Explore the best of PBS science programs and science news. Video and web content from your favorite PBS shows like Nature, NOVA, and more. Animals, space and astronomy, natural history, environment ...

Similar to humans and other animals with higher intelligence, the executive center of a bird's brain allows them to strategize and organize ideas.

Egyptian desert fossils reveal clues to the evolution of the biggest animals on Earth. A spectacular fossil graveyard reveals a 43-million-year-old whale that had four legs and could walk. Follow ...

For more than 50 years, NOVA has been inspiring people with stories of science that spark curiosity and illuminate the ways that science can solve important problems and improve lives. In classrooms ...