All of modern society relies upon a seemingly simple but surprisingly complex unit of measurement: the second. But knowing exactly what a “second” is is more complicated than you might think!

Units are a major way we describe the world around us, and by looking at the scientists some of them are named after, we can get a sense of how we’ve learned so much about our universe.

Today in many countries solar is the cheapest form of energy to produce. Millions of homes are equipped with rooftop solar, with most units paying for themselves in their first seven to 12 years and then generating further savings. So,...

This week marks one year since Russia’s full-scale invasion of Ukraine. In the eastern part of the country, frontline units are working to modernize a war that has often seemed an echo from last century. Nick Schifrin and videographer...

The San Francisco Bay Area has a rising homeless population. On any given

night, an estimated 35,000 individuals are without a place to
live.
Meanwhile, the cost of living continues to climb. Much effort has
gone...

The Congo Basin is home to the world’s second-largest rainforest and a unique array of biodiversity. But the ecosystem's remote location cannot protect it from the threat of poaching. Special correspondent Monica Villamizar and...

A method for thinking about high-dimensional spheres, introduced in the context of a classic example involving a high-dimensional sphere inside a high-dimensional box.

A method for thinking about high-dimensional spheres, introduced in the context of a classic example involving a high-dimensional sphere inside a high-dimensional box.

What is the dot product? What does it represent? Why does it have the formula that it does? All this is explained visually.

In this video Paul Andersen explains how a system can be viewed as an object and an object can be viewed as a system.

Today we’ll cover the fourth and final of our core disciplines of engineering: chemical engineering. We’ll talk about its history and evolution going from soda ash competitions to oil refineries and renewable energies. We’ll also discuss...

The elephant is a creature of epic proportions -- and yet, it owes its enormity to more than 1,000 trillion microscopic cells. And on the epically small end of things, there are likely millions of unicellular species, yet there are very...

SciShow Quiz Show is back, with familiar faces Hank Green and Lindsey Doe matching wits about ancient science, puppies, and all kinds of words that have “sex” in them!

The kilogram is the basic unit of mass in the metric system, but there's a serious problem: the standard that defines how much mass a kilogram actually has isn't reliable anymore

A quick explanation of e^(pi i) in terms of motion and differential equations

One bag of apples, one apple, one slice of apple -- which of these is one unit? Explore the basic unit of math (explained by a trip to the grocery store!) and discover the many meanings of one.

What's a proven way to lower your energy costs? Would you believe: learning what your neighbor pays. Alex Laskey shows how a quirk of human behavior can make us all better, wiser energy users, with lower bills to prove it.

In this video Paul Andersen explains how scientific phenomenon and sensemaking can be used in the science classroom to engage students and drive inquiry.

Majd Mashharawi was walking through her war-torn neighborhood in Gaza when an idea flashed in her mind: What if she could take the rubble and transform it into building materials? See how she designed a brick made out of ashes that's...

Wes Moore joined the US Army to pay for college, but the experience became core to who he is. In this heartfelt talk, the paratrooper and captain -- who went on to write "The Other Wes Moore" -- explains the shock of returning home from...

Giant disks around baby stars filled with gas and dust provide the material to make all sorts of planets, and new evidence proves that our solar system’s had a massive gap in it! And the water vapor in Jupiter’s moon, Europa, might not...

Black Americans have long fought in America's wars, very often fighting for a country that doesn't always fight for them. Today we'll learn about the experience of Black Americans in World War II. We'll look at the ways Black men and...

Michael McDaniel designed housing for disaster relief zones -- inexpensive, easy to transport, even beautiful – but found that no one was willing to build it. Persistent and obsessed, he decided to go it alone. At TEDxAustin, McDaniel...

In 1967, Moshe Safdie reimagined the monolithic apartment building, creating “Habitat ’67,” which gave each unit an unprecedented sense of openness. Nearly 50 years later, he believes the need for this type of building is greater than...