View full lesson: http://ed.ted.com/lessons/how-to-avoi… Have you ever talked with a friend about a problem, only to realize that he just doesn’
Read moreView full lesson: http://ed.ted.com/lessons/the-arctic-… How can you tell the two poles apart? Where are the penguins? What about the bears? The
Read moreView full lesson: http://ed.ted.com/lessons/how-blood-p… If you lined up all the blood vessels in your body, they’d be 60 thousand miles long. A
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Read moreView full lesson: http://ed.ted.com/lessons/how-do-anim… To human eyes, the world at night is a formless canvas of grey. Many nocturnal animals,
Read moreView full lesson: http://ed.ted.com/lessons/mysteries-o… Stemming from the days of bubonic plague in Medieval Europe, quarantines were originall
Read moreView full lesson: http://ed.ted.com/lessons/why-do-our-… Human bodies aren’t built for extreme aging: our capacity is set at about 90 years. But
Read moreView full lesson: http://ed.ted.com/lessons/why-wasn-t-… When you think of the US Constitution, what’s the first thing that comes to mind? Free
Read moreView full lesson: http://ed.ted.com/lessons/where-we-ge… Fresh water accounts for only 2.5% of Earth’s water, yet it is vital for human ci
Read moreView full lesson: http://ed.ted.com/lessons/how-we-thin… Imagine you swallowed a small bird and suddenly gained the ability to fly … or you ate
Read moreView full lesson: http://ed.ted.com/lessons/what-orwell… If you’ve watched the news or followed politics, chances are you’ve heard the term Orwe
Read moreView full lesson: http://ed.ted.com/lessons/the-surpris… It starts with a tickle in your throat that becomes a cough. Your muscles begin to ache
Read moreView full lesson: http://ed.ted.com/lessons/when-will-t… About 66 million years ago, a terrible extinction event wiped out the dinosaurs. But it
Read moreView full lesson: http://ed.ted.com/lessons/where-did-r… Russia is the biggest country in the world, spanning one-eighth of the earth’s landmass
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