When we last left Jessi and Squeaks, Jessi had a big problem: her back was really itchy! Today we'll share our designs for back scratchers and build something to help her out!

Worldchanging.com founder Alex Steffen argues that reducing humanity’s ecological footprint is incredibly vital now, as the western consumer lifestyle spreads to developing countries.

Child prodigy Adora Svitak says the world needs "childish" thinking: bold ideas, wild creativity and especially optimism. Kids' big dreams deserve high expectations, she says, starting with grownups' willingness to learn from children as...

When we ditch our assumptions, new ideas can enter the world, says filmmaker Zach King. In an entertaining talk full of props and surprises, King shows us the trick to regaining our sense of childlike wonder through the power of...

What swims in rivers and the ocean and is an awesome parent? Jessi and Squeaks talk about the amazing life cycle of salmon.

The weather is warming up where Jessi lives, which means its time for some cool treats! Join Jessi and Squeaks and learn how to whip up some tasty vanilla ice cream!

From pancakes to ice cream, salt goes in so many things to make them taste better! But what is it and where does it come from?

What happens before a murder? In looking for ways to reduce death penalty cases, David R. Dow realized that a surprising number of death row inmates had similar biographies. In this talk he proposes a bold plan, one that prevents murders...

How do you deal with a bully without becoming a thug? In this wise and soulful talk, peace activist Scilla Elworthy maps out the skills we need -- as nations and individuals -- to fight extreme force without using force in return. To...

Jessi and Squeaks love getting interesting science questions from their friends! Join them as they check their email and answer questions from kids like you!

Alleviating poverty is more guesswork than science, and lack of data on aid's impact raises questions about how to provide it. But Clark Medal-winner Esther Duflo says it's possible to know which development efforts help and which hurt...

Where does OK Go come up with ideas like dancing in zero gravity, performing in ultra slow motion or constructing a warehouse-sized Rube Goldberg machine for their music videos? In between live performances of "This Too Shall Pass" and...

Jessi got so cold outside that she got goosebumps! Join her and Squeaks as they learn what causes your body to make these bumps in the first place.

Jessi and Squeaks were supposed to go sledding today, but it's really cold outside! That won't stop them from having fun, though! Join them as they look back on some great experiments to do on a freezing cold day!

You may know about The Marshmallow Test, a popular psychological exam to see if people have willpower, but psychologists found that it might not be measuring willpower after all.

Kevin Surace suggests we rethink basic construction materials -- such as the familiar wallboard -- to reduce the huge carbon footprint generated by the manufacturing and construction of our buildings. He introduces EcoRock, a clean,...

When you were a kid, did anyone ever tell you that your head would explode if you hung upside down for too long? Well... they might have been on to something.

In this video Paul Andersen shows you how you can use modeling to have your students construct explanations in the science classroom.

Trees need water to grow, so how do Redwood trees get so big, despite the fact that it gets so dry?



First Grade Next Generation Science

Standards

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Forget the latest disease in the news: Cardiovascular disease kills more people than everything else combined -- and it’s mostly preventable. Dr. Dean Ornish explains how changing our eating habits can save lives.

The earth is a big place to keep clean. With Litterati -- an app for users to identify, collect and geotag the world's litter -- TED Resident Jeff Kirschner has created a community that's crowdsource-cleaning the planet. After tracking...

When Michael Bierut was tapped to design a logo for public school libraries, he had no idea that he was embarking on a years-long passion project. In this often hilarious talk, he recalls his obsessive quest to bring energy, learning,...

Why are mosquito bites so itchy? Stop scratching while Jessi explains!

Massimo Banzi helped invent the Arduino, a tiny, easy-to-use open-source microcontroller that's inspired thousands of people around the world to make the coolest things they can imagine -- from toys to satellite gear. Because, as he...