History vs. Sigmund Freud – Todd Dufresne

From TED Ed. Download a free audiobook version of "Why We Sleep" and support TED-Ed’s nonprofit mission: https://www.audible.com/ted-ed Check out our full book recommendation: https://shop.ed.ted.com/collections/ted-ed-book-recommendations/products/why-we-sleep — Working in Vienna at the turn of the 20th century, he began his career as a neurologist before pioneering the discipline of psychoanalysis, and his influence towers above that…

What is schizophrenia? – Anees Bahji

From TED Ed. Discover what we know— and don’t know— about the symptoms, causes, and treatments of schizophrenia. — Schizophrenia was first identified more than a century ago, but we still don’t know its exact causes. It remains one of the most misunderstood and stigmatized illnesses today. So what do we actually know about its…

Why isn’t the Netherlands underwater? – Stefan Al

From TED Ed. Dig into the incredible engineering of the Netherlands’ Delta Works— the most sophisticated flood prevention system in the world. — In January 1953, a tidal surge shook the North Sea. The titanic waves flooded the Dutch coastline, killing almost 2,000 people. 54 years later, a similar storm threatened the region. But this…

How one scientist took on the chemical industry – Mark Lytle

From TED Ed. Discover the groundbreaking environmental work of Rachel Carson, whose book “Silent Spring” explores how human actions threaten the balance of nature. — In 1958, after receiving a letter describing the deaths of songbirds due to the pesticide known as DDT, Rachel Carson began an investigation into the misuse of chemicals and their…

What’s a squillo, and why do opera singers need it? – Ming Luke

From TED Ed. Discover the techniques opera singers use to project their voices over the orchestra and the importance of a singer’s squillo. — An orchestra fills an opera house with music, but a singer’s voice soars above the instruments. Its melody rings out across thousands of patrons— all without any assistance from a microphone.…