Tag «TED-Ed»

Where did Russia come from? – Alex Gendler

Where did Russia come from? – Alex Gendler

Where did Russia come from, why is it so big, and what are the differences between it and its neighbors? The answers lie in an epic story of seafaring warriors, nomadic invaders, and the rise and fall of a medieval state known as Kievan Rus. In the first millennium, a large group of tribes spread …

Ugly History: Witch Hunts – Brian A. Pavlac

Ugly History: Witch Hunts – Brian A. Pavlac

In the German town of Nördlingen in 1593, an innkeeper named Maria Höll found herself accused of witchcraft. She was arrested for questioning, and denied the charges. She continued to insist she wasn’t a witch through 62 rounds of torture before her accusers finally released her. Rebekka Lemp, accused a few years earlier in the …

What is the world wide web? – Twila Camp

What is the world wide web? – Twila Camp

The World Wide Web, where you’re likely watching this video, is used by millions of people every day for everything from checking the weather, ordering food, and chatting with friends to raising funds, sharing news, or starting revolutions. We use it from our computers, our phones, even our cars. It’s just there, all around us, …

The 2,400-year search for the atom – Theresa Doud

The 2,400-year search for the atom – Theresa Doud

What do an ancient Greek philosopher and a 19th century Quaker have in common with Nobel Prize-winning scientists? Although they are separated over 2,400 years of history, each of them contributed to answering the eternal question: what is stuff made of? It was around 440 BCE that Democritus first proposed that everything in the world …

The Survival of the Sea Turtle

The Survival of the Sea Turtle

Sea turtles are miraculous. First, they’ve been around since the late Jurassic, roughly 150 million years ago. Cohorts of the dinosaurs, sea turtles have survived through the challenges of eons, existing still today, where many others have ended their evolutionary run. Second, throughout the centuries and up till today, every living adult sea turtle has …

The history of chocolate – Deanna Pucciarelli

If you can’t imagine life without chocolate, you’re lucky you weren’t born before the 16th century. Until then, chocolate only existed in Mesoamerica in a form quite different from what we know. As far back as 1900 BCE, the people of that region had learned to prepare the beans of the native cacao tree. The …