If you live in the Northern Hemisphere, it's almost time for the summer solstice, the longest day of the year! But if all days have 24 hours, what does the 'longest day of the year' really mean? Join Jessi and Squeaks to find out!

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!

Today, glasses help millions of people with poor vision be able to see clearly. But how? Andrew Bastawrous and Clare Gilbert help unravel the answer by explaining refraction - the ability of a transparent medium, like glass, water, or...

Neglect in the first few years of a child’s life can have many adverse consequences, and one of the largest studies on these effects occurred after the Romanian Revolution in 1989.

The hair on your scalp can get really long, but your leg hair doesn't sweep the floor. Why not?

Staring into the mirror in a dark room can play some nasty tricks on your brain. Like many illusions, this can tell us about how your brain processes images.

Arms and legs are pretty similar, from the amount of bones they have to the way their joints bend, but your legs have one thing your arms don't: kneecaps. Ever wonder why?

The Editor is yet another unsung hero in the filmmaking process. For a century of film history, Editors have taken raw footage and worked to transform it into a cohesive whole. Basically making one thing from many. But, how do they do...

Corals in the Pacific Ocean have been dying at an alarming rate, particularly from bleaching brought on by increased water temperatures. But it's not too late to act, says TED Fellow Kristen Marhaver. She points to the Caribbean -- given...

Bears forgo many activities to conserve their energy in the winter when food is scarce, including eating, peeing, and pooping. There is one thing that they specifically DO do during the winter, though: give birth! But, giving birth...

Vegan chef (and head chef of TED Countdown Summit) Derek Sarno is on a mission to unleash the mighty power of plants, creating nutritious food from mushrooms and vegetables that's full of texture and flavor -- and good for the planet. He...

Have you ever wondered why your shadow is longer sometimes and shorter others? It turns out it all has to do with that marvelous big ball of light in the sky; The Sun! This first series is based on 5th grade science. We're super excited...

In this video Paul Andersen defines impulse as the product of the force applied and the time over which the force is applied. The impulse of an object is equivalent to the change in momentum of the object. Several problems related to...

If you’re trying to figure out where to plan on sheltering during the zombie apocalypse, it’s essential to know whether zombies sink or float!

Scientists have found Coral reefs in new, dazzling colors, but this is a warning that the reefs are stressed out.

On a cold day, sometimes people will say "I'm freezing!," even though they aren't actually frozen like ice. But there is a very special animal that can say "I'm freezing" and mean it: wood frogs! Join Jessi and Squeaks to...

Why do we often wait so long to recognize each other's gifts? Why are the truest compliments for the people we love often said only after they're no longer around to hear and savor them? Andrea Driessen makes the case for writing...

From turf toe to toxic Zamboni's, sports injuries aren't just for pro athletes.

Is the universe expanding? About a hundred years ago astronomers made a discovery that helped us unravel the mystery of the history of the universe!

When life emerged on Earth about 4 billion years ago, the earliest microbes had a set of basic genes that succeeded in keeping them alive. In the age of humans and other large organisms, there are a lot more genes to go around. Where did...

Jessi and Squeaks love pretending to be space explorers, visiting far-away planets! Did you know that, right now, there are scientists working on ways to send people to other planets in real life? And where better to start than our...

Do you like to go hiking like Jessi and Squeaks do? Have you ever wondered how those mountains you're hiking on got there? Check out this episode to learn how mountains form, and how mountains can keep growing!

In this video Paul Andersen explores population dynamics of the human population. The population has show exponential growth since the industrial revolution and all countries will eventually move through the demographic transition. If...

Living in a cave isn’t easy, but these six cave-dwelling animals have gained some amazing traits to help them survive there!