If you find some trees with little apple-like fruits by the ocean, beware! It might be a Manchineel, the world's most dangerous tree.

Squeaks and Mister Brown learn all about echolocation, and how animals use it to sense things! First Grade Next Generation Science Standards Crosscutting Concept: Structure and Function: The way an object is shaped or structured...

TOP 10 REASONS Why We Know the Earth is Round

Phones, TVs, solar panels, and electric car batteries are all made of some rare and unusual elements. As our modern world creates more and more of these technologies, will things go from "rare" to "nonexistent" and what will we do then?

If you always end up soaked while your friends are barely glistening, you might have wondered why your sweat glands are so… sweaty.

When you imagine the energy of the future, solar power is probably in the picture – but in recent years, less than 2% of the world’s electricity has come from solar power. Here are 5 new inventions that are likely to change that.

Our planet was once populated by megafauna, big top-of-the-food-chain predators that played their part in balancing our ecosystems. When those megafauna disappear, the result is a "trophic cascade," where every part of the ecosystem...

Research suggests that more diverse ecosystems are better for the bottom line.

Thanks to the University of Minnesota for sponsoring this video!
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Morocco has 3/4 of the world’s known...

Everyone does it -- using oil, that is. But how much do we have left? How do scientists find it? And where are they looking for it now that the easiest pickings have been taken? Hank has the answers to the how, why and how...

Film has the power to change the way we think about ourselves and our culture. Documentarian and TED Fellow Sharmeen Obaid-Chinoy uses it to fight violence against women, turning her camera on the tradition of honor killings in Pakistan....

Thanks to the Space Telescope Science Institute (STScI) and NASA's James Webb Space Telescope for supporting this video! In particular, thanks to Dan Coe of STScI for taking the time to chat with me about what we do and don't know about...

Learn all about archaeologists: the scientists who solve the great mysteries of human history!

So, we've built a lot of things over the last year and we've become awesome engineers in the process. But now it's time for a real challenge. Let's build a city! That's right, you heard me! In this episode, Sabrina shows us what we need...

Mount Everest is unquestionably the highest point on earth, but it doesn't always feel that way.

It's been raining for a few days where Jessi and Squeaks live, and the news even said that there may be a flood! Join Jessi to find out what a flood is, how they form, and how you can stay safe if there's a flood where you live!

In which John Green investigates the dawn of human civilization. John looks into how people gave up hunting and gathering to become agriculturalists, and how that change has influenced the world we live in today. Also, there are some...

Jessi and Squeaks are ready to go outside, but before they do, Jessi needs to make sure to put on sunscreen so that she doesn't get a sunburn!

Low-status neighborhoods in the US are often stuck between stagnating assistance from the government and gentrification at the hands of real estate developers. The result is that the brightest minds are convinced that "success" means...

In which John Green teaches you how the Civil War played a large part in making the United States the country that it is today. He covers some of the key ways in which Abraham Lincoln influenced the outcome of the war, and how the lack...

Mister Brown and Squeaks learn all about glaciers, and the clues they leave behind when they melt!



Science and Engineering
Practices:
Developing a

nd Using Models

>Disciplinary Core...

Too often, people feel checked out of politics — even at the level of their own city. But urban activist Alessandra Orofino thinks that can change, using a mix of tech and old-fashioned human connection. Sharing examples from her...

In the Zagros Mountains of Iran lie some strange, multi-colored glaciers that don’t melt, even in the heat of summer. But, in a rainstorm, these glaciers will start to dissolve away.

What is an underground economy? Whether you call it a black market, a grey market, or just the shop down the street, its about connecting people with goods outside of official channels. Some stuff happens in the underground economy...