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Why didn't the Europeans get sick when they made contact with the American Indians?

View full lesson: http://ed.ted.com/lessons/how-did-hitler-rise-to-power-alex-gendler-and-anthony-hazard Decades after the fall of the Third Reich, it feels impossible to understand how Adolf...

View full lesson: https://ed.ted.com/lessons/the-controversial-origins-of-the-encyclopedia-addison-anderson The first encyclopedia contained 70,000 entries and over 20,000,000 words. It...

View full lesson: http://ed.ted.com/lessons/what-makes-the-great-wall-of-china-so-extraordinary-megan-campisi-and-pen-pen-chen The Great Wall of China is a 13,000-mile dragon...

View full lesson: http://ed.ted.com/lessons/tycho-brahe-the-scandalous-astronomer-dan-wenkel If you think scientists lead boring, monotonous lives, you must not know about Tycho Brahe. The 16th Century...

View full lesson: http://ed.ted.com/lessons/history-vs-christopher-columbus-alex-gendler Many people in the United States and Latin America have grown up celebrating the anniversary of Christopher Columbus’s...

View full lesson: http://ed.ted.com/lessons/the-past-present-and-future-of-the-bubonic-plague-sharon-n-dewitte The bubonic plague, which killed around 1/5 of the world’s population...

View full lesson: http://ed.ted.com/lessons/the-atlantic-slave-trade-what-your-textbook-never-told-you-anthony-hazard Slavery has occurred in many forms throughout the world, but...

View full lesson: http://ed.ted.com/lessons/history-vs-napoleon-bonaparte-alex-gendler After the French Revolution erupted in 1789 CE, Europe was thrown into chaos. Neighboring countries’ monarchs feared...

View full lesson: http://ed.ted.com/lessons/where-did-russia-come-from-alex-gendler Russia is the biggest country in the world, spanning one-eighth of the earth’s landmass. But where did it all begin? Alex...