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Lessons Worth Sharing We made a public speaking course! Download our *BRAND NEW* app: TED Masterclass! We've got an exciting announcement! Our official public speaking course TED Masterclass is now available to everyone. Being an excellent communicator is one of the most valued skills in today's world, and at TED we believe everyone has an idea worth spreading. Learn to communicate in a way that captures the attention of those around you with TED Masterclass. Learn more here » TED-Ed originals Game theory challenge: can you predict human behavior? By Lucas Husted, directed by Nabil Burias Consider the claw. Frequently found on animals around the world, it's one of nature's most versatile tools. Bears use claws for digging as well as defense. An eagle's needle-like talons can pierce the skulls of their prey. Even the ancestors of primates used to wield these impressive appendages, until their claws evolved into nails. So what caused this adaptation? Matthew Borths investigates. View the animation » The Taino myth of the cursed creator By Bill Keegan, directed by Franz Palomares Before the world of humans began, there was the world of the gods. Four brothers wandered this celestial realm. One day, the brothers snuck into a spirit's house and spotted a giant gourd hanging in the corner. But as they tried to look inside the gourd, they dropped it. It broke apart, releasing a deluge that formed a new world. Bill Keegan details the Taino myth of Deminan and the sea. View the animation » Why haven't we cured arthritis? By Kaitlyn Sadtler and Heather J. Faust, directed by Bálint Farkas Gelley The bad backs, elbow pain, and creaky knees so common in older people often aren't just "old age." In fact, the source of this stiffness plagues many young people as well. The culprit is arthritis: a condition that affects over 90 million people in the U.S. alone. What makes arthritis so pervasive, and why haven't we found a cure for it? Kaitlyn Sadtler and Heather J. Faust investigate. View the animation »