Topic: TED Ed

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The science of milk

Milk is poured into cereal. We might want milk for our cookies or hot chocolate. We can use milk to bake. It's usually in our cheeses, butters, and ice creams. Milk is often the first thing we drink as newborn babies....

Can you solve the counterfeit coin riddle?

You're currently locked in the dungeon by orders of the king, but as the realm’s greatest mathematician, you've been given a chance to free yourself: If you can identify a counterfeit coin, one fake coin in a group of...

Why are we so attached to our things? – TED Ed

After witnessing the “violent rage” shown by babies whenever deprived of an item they considered their own, Jean Piaget – a founding father of child psychology – observed something profound about human nature: Our sen...

How high can you count on your fingers?

How high can you count on your fingers? It seems like a question with an obvious answer. After all, most of us have ten fingers -- or to be more precise, eight fingers and two thumbs. This gives us a total of ten digi...

What’s the fastest way to alphabetize your bookshelf?

You work at the college library. You’re in the middle of a quiet afternoon when suddenly, a shipment of 1,280 books arrives. The books are in a straight line, but they're all out of order, and the automatic sorting sy...

Can you solve the river crossing riddle? – TED Ed

How do three lions and three wildebeests, fleeing from a wildfire, cross over to the left bank of a crocodile-infested river to escape the flames? There's a raft! But there are a few rules that must be followed in ord...

What causes cavities?

When a team of archeologists recently came across some 15,000-year-old human remains, they made an interesting discovery: the teeth of those ancient humans were riddled with holes. So what causes cavities, and how can...

Why are there so many types of apples?

Gala, Braeburn, Fuji, SweeTango, SnapDragon, Golden Delicious, Cosmic Crisp... there are over 7,500 known cultivars—varieties produced by selectively breeding desirable characteristics—of the apple. How are there that...

How do animals see in the dark?

How do animals see in the dark... and sometimes in color? Learn more about the night vision of the tarsier, cats, toads, and hawkmoths in this illuminating animation from TED Ed. Learn more about eyes in these videos.

Why the metric system matters

The United States is one of three countries in the world that has not adopted the metric system, and that may fall to two if Burma embraces metrication. How did inches, feet, pounds, gallons, and other familiar United...

Why do some people have seasonal allergies?

If you've ever experienced watery eyes, sneezing, runny nose, itchy throat, and other allergic reactions during springtime, or you haven't but you know someone who has, this beautifully animated TED Ed by Eleanor Nels...

How do eyes work & how do glasses help us see?

Glass, water, and the eye are three different transparent mediums that change the direction of light, a phenomenon called refraction. Refraction in the eye helps us see by bending light into an accurately focused poin...

Can you solve the locker riddle? – TED Ed

File under factors, multiples, square numbers, prime numbers, and sequences: This classic mystery novel set up has a wonderful math puzzle twist: Your rich, eccentric uncle just passed away, and you and your 99 na...

Can you solve the frog riddle? – TED Ed

You’re stranded in a rainforest, and you’ve eaten a poisonous mushroom. To save your life, you need an antidote excreted by a certain species of frog. Unfortunately, only the female frog produces the antidote. The mal...

Can you solve the temple riddle? – TED Ed

Your expedition finally stands at the heart of the ancient temple. But as you study the inscriptions in the darkness, two wisps of green smoke burst forth. The walls begin to shake. The giant sandglass begins flowing ...

How the International Space Station Was Built – TED Ed

How do you build something that's the size of a six bedroom house and weighs more than 320 cars, all while orbiting the Earth at 17,398 miles (28,000 km) per hour? Assemble it piece by piece, and with lots of collabor...

Why is biodiversity so important? – TED Ed

Biodiversity, short for biological diversity, is the term we use for the variety of animals, plants, fungi, bacteria, and other intertwined life forms within any ecosystem... "from towering redwood trees to tiny, sing...

The mathematical secrets of Pascal’s triangle – TED Ed

It's known as Pascal's triangle in the Western world, but centuries before that, it was the Staircase of Mount Meru in India, the Khayyam Triangle in Iran, and Yang Hui's Triangle in China. It can look complicated at ...

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