Every day, humans literally flush a valuable resource down the toilet: nitrogen. But there are some animals that have figured out a way to recycle the extra nitrogen in their bodies by moving it not to their livers, but to their mouths!

How do you think about the column space and null space of a matrix visually? How do you think about the inverse of a matrix?

Hank takes us through the bowels of the human digestive system and explains why it's all about surface area.

Paul Andersen explains how biology is ordered in the hierarchy of life. He first of all describes how emergent properties appear as you move to more inclusive systems. The then describes life at the following levels; atom, molecule,...

Artificial intelligence is all around us ... and the future will only bring more of it. How can we ensure the AI systems we build are responsible, safe and sustainable? Ethical AI expert Genevieve Bell shares six framing questions to...

In this video Paul Andersen explains how you can get your students asking more and better scientific questions.

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

In this video Paul Andersen explains how heat can be absorbed in endothermic or released in exothermic reactions. An energy diagram can be used to show energy movements in these reactions and temperature can be used to measure them...

You're on an airplane when you feel a sudden jolt. Outside your window nothing seems to be happening, yet the plane continues to rattle you and your fellow passengers as it passes through turbulent air in the atmosphere. What exactly is...

Can Twitter be saved? In a wide-ranging conversation with TED's Chris Anderson and Whitney Pennington Rodgers, Twitter CEO Jack Dorsey discusses the future of the platform -- acknowledging problems with harassment and moderation and...

Double stars are stars that appear to be near each other in the sky, but if they’re gravitationally bound together we call them binary stars. Many stars are actually part of binary or multiple systems. If they are close enough together...

In this video Paul Andersen explains how the second law of thermodynamics applies to reversible and irreversible processes. In a reversible process the net change in entropy is zero. In and irreversible process the entropy will always...

Noah Feldman makes a searing case that both politics and religion -- whatever their differences -- are similar technologies, designed to efficiently connect and manage any group of people.

This is the updated Amoeba Sisters human organ systems video, which provides a brief function introduction to each of the 11 human organ systems. Table of Contents: Intro 00:00 Levels of Organization 0:49 Circulatory 1:39 Digestive 2:40...

Amy Webb was having no luck with online dating. The dates she liked didn't write her back, and her own profile attracted crickets (and worse). So, as any fan of data would do: she started making a spreadsheet. Hear the story of how she...

Is outer space really the silent and lifeless place it's often depicted to be? Perhaps not. Astrophysicist and musician Matt Russo takes us on a journey through the cosmos, revealing the hidden rhythms and harmonies of planetary orbits....

How many species are there on Earth? In biology, this is one of a fundamental question that we still don't have a very good answer for. Imagine if chemists didn't know all the elements of the periodic table, or if physicists didn't know...

To feed everyone in the future, we may need to disrupt 10,000 years of farming practices and turn agriculture into a closed system.

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Here on Earth, we’re used to seeing both lunar and solar eclipses. But further out are eclipses that don’t behave at all the way we expected them to.

On earth a sound echo lets you hear something again. Over great distances, a light echo can let you see something again, specifically an exploding star.

Save the rainforest is an environmental slogan as old as time — but Tasso Azevedo catches us up on how the fight is actually going these days. Spurred by the jaw-dropping losses of the 1990s, new laws (and transparent data) are helping...

In this video Paul Andersen explains how the reaction path can be described in an energy profile. Enough energy must be added to reach the activation energy required and stress the bonds. Eventually the bonds break and new bonds are...

Paul Andersen attempts to explain Gibbs Free Energy. He begins by using three spontaneous reactions to explain how a change in enthalpy, entropy and temperature can affect the free energy of a system. He then applies this concept to...

Statistically, the least reliable part of the car is ... the driver. In 2015, Chris Urmson was head of Google's driverless car program, one of several efforts to remove humans from the driver's seat. He shares fascinating footage that...

In this video Paul Andersen explains how the energy, charge, and momentum in a system is conserved over time.