"Complete silence is very addictive," says Rebecca Knill, a writer who has cochlear implants that enable her to hear. In this funny, insightful talk, she explores the evolution of assistive listening technology, the outdated way people...

Jessi and Squeaks talk about some surprise visitors that came to check out their picnic: Ants!

Feeling motivated? Even if you are, do you know why? The story of Aaron Ralston can tell us a lot about motivation. In this episode of Crash Course Psychology, Hank tells us Ralston's story, as well as 4 theories of motivation...

How did we come up with our system of telling time? Why do we divide the day into 24 hours of 60 minutes each, and put 60 seconds in each minute? Where does the definition of a second come from? And who decides what clock shows the...

Many animals use the same five senses as we do, but these creatures take that beyond the next level.

Terrorists and extremists aren't all naturally violent sociopaths -- they're deliberately recruited and radicalized in a process that doesn't fit into a neat pattern. erin Marie Saltman discusses the push and pull factors that cause...

Even if you have a dog of your own, we bet you don’t know these three amazing things about our furry best friends!

Today we’re going to start thinking about materials that are used in engineering. We’ll look at mechanical properties of materials, stress-strain diagrams, elasticity and toughness, and describe other material properties like hardness,...

Today, we're looking at measures of spread, or dispersion, which we use to understand how well medians and means represent the data, and how reliable our conclusions are. They can help understand test scores, income inequality, spot...

Hunger claws at your belly. It tugs at your intestines, which begin to writhe, aching to be fed. Being hungry generates a powerful and often unpleasant physical sensation that's almost impossible to ignore. After you've reacted by...

Due to a revolution in our understanding of the tree of life, birds are dinosaurs, while dimetrodons are not.

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FYI: We try to leave jargon out...

Hank explains the little we know about the perceptual condition known as synesthesia, where a person involuntary associates one sensation or experience with another sensation.

Biology and technology grew closer together when scientists manufactured neurons that acted like those in a brain! And birds evolved to protect themselves in two ways: fight and flight.

In this video Paul Andersen explains how light can be treated as both a particle and a wave. Physicists use scale to determine which model to use when studying light. When the wavelength of light is equivalent to the size of the object...

Learn how trees are able to communicate with each other through a vast root system and symbiotic fungi, called mycorrhizae. -- Most of the forest lives in the shadow of the giants that make up the highest canopy. These are the oldest...

Ah, hiccups. They are typically harmless, and yet also very annoying. But why do they happen in the first place?

Just because there are four dimensions doesn't mean there's a "fourth dimension"

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.

The binomial distribution, introduced as setup to talk about the beta distribution

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...

Hank tells us about new research into the question of how animals navigate from place to place - while the problem is still unresolved, we do have some hypotheses, and they all involve something called "magnetoreception."

The Greek philosopher Aristotle used sensory experiences and body parts to propose that humans have five senses. But almost as soon as he proposed them, people noticed things that didn’t fit the bill. And the debate has continued ever...

What happens when your senses come into conflict with each other? In this episode of SciShow, Hank talks about motion sickness: why we have this nauseating experience and how we can avoid it or treat it.

The world doesn't have to be shrouded in mystery to be fascinating! Here are 6 mysteries that science has managed to solve.

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