Topic: TED Ed

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Why are sloths so slow?

Around 35 million years ago, Earth was populated with giant, prehistoric ground sloths like Megalonyx jeffersonii (named after Thomas Jefferson), Paramylodon, and Megatherium who, until around 10,000 years ago, roamed...

Oxygen’s surprisingly complex journey through your body

Oxygen forms about 21% of the air around us. In your body, oxygen forms a vital role in the production of energy in most cells. But if gases can only efficiently diffuse across tiny distances, how does oxygen reach th...

Can you solve the virus riddle?

Your research team has found a prehistoric virus preserved in the permafrost and isolated it for study. After a late night working, you’re just closing up the lab when a sudden earthquake hits and breaks all the sampl...

How to practice effectively…for just about anything

Mastering any physical skill takes practice. Practice is the repetition of an action with the goal of improvement, and it helps us perform with more ease, speed, and confidence. But what does practice actually do to m...

Can you solve the hardest logic puzzle ever created?

You've crash landed on an alien planet. The only way to get home is to give the correct artifacts to the planet's three alien overlords: Tee, Eff, and Arr. The challenge: Which alien overlord is which? You can fin...

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...

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