PBS LearningMedia

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 no practical sense. NOVA investigates the riddle of outsize weaponry and uncovers a bold new theory about what triggers an animal arms race.

Native America explores the world created by America’s First Peoples. The four part series reaches back 15,000 years to reveal massive cities aligned to the stars, unique systems of science and spirituality, and 100 million people connected by social networks spanning two continents.