What causes opioid addiction, and why is it so tough to combat? – Mike Davis

Explore the science of why opioids are addictive and what can be done to reverse the…

A brief history of chess – Alex Gendler

Trace the storied history of the game of chess, from its origins in 7th century India…

The history of the world according to cats – Eva-Maria Geigl

Sign up for our newsletter and never miss an animation: http://bit.ly/TEDEdNewsletter View full lesson: https://ed.ted.com/lessons/the-history-of-the-world-according-to-cats-eva-maria-geigl In…