Modern life runs on wireless technology. What if the energy powering our devices could also be transmitted without wires? Electrical engineer Ali Hajimiri explains the principles behind wireless energy transfer and shares his far-out...

If we're going to solve the climate crisis, we need to talk about construction. The four main building materials that humans currently use -- concrete, steel, masonry and wood -- have a heavy environmental impact, but what if we had a...

As Squeaks continues to prep for his big trip with Jessi, Mr. Brown helps him learn all about how the wind outside the fort will also affect how long his airplane ride with Jessi takes!

Did you ever wonder how some squirrels find food in the cold winter? Mister Brown and Squeaks learn all about it this week as they discover a squirrel midden on their hike!

Watch. Dime. Develop. Powder. Pantry. Dirt. That's right, it's time for a dip into the random, because we're talking about the Dada theater that grew out of Symbolism, and the Surrealist theater that followed Dada. You'll learn about...

We all experience it: that desire to do something wrong just for the sake of it. Whether it's walking on manicured grass or sticking your finger in a friend's ice cream, psychologist Paul Bloom invites us to see the clever, creative and...

Medieval Europe. Where unbathed, sword-wielding knights ate rotten meat, thought the Earth was flat, defended chastity-belt wearing maidens, and tortured their foes with grisly gadgets. Except... this is more fiction than fact. So, where...

How do we make historically exclusive fields like classical music, fine arts or academic research more accessible to everyone? Education equalizer and violist Matthew Garcia thinks one way to remove barriers is to create free, virtual...

Despite common belief, retirement takes more than financial planning. And while you may be beyond ready to go on permanent vacation, you also have to psychologically prepare for when the novelty wears off. Riley Moynes explains the four...

Whose pleasure is prioritized during sex, and why? Psychosexologist Karen Gurney explains how a lack of equal pleasure in the bedroom actually reflects broader gender inequality in society -- and asks you to reconsider what dynamics are...

Paul Andersen (with the help of PatricJMT) explains why mathematics may be biology's next microscope.

What Cramer's rule is, and a geometric reason it's true

John Green is teaching history again. This time, we're looking at the history of Europe in 50 episodes. We'll start at the tail end of the so called Middle Ages, and look at how Europe's place in the world has developed and changed in...

What is a vector space? Even though they are initial taught in the context of arrows in space, or with vectors being lists of numbers, the idea is much more general and far-reaching.

Some online quizzes would have you believe the idea that certain people have a specific “personality type”. But is an “addictive personality” a real thing?

In this episode of the Space Time Journal Club Matt discusses how two independent research teams created their own Time Crystals, a form of matter that breaks time translational symmetry and could be used in quantum computers.

Paul Andersen explains how scientists modify theories by constructing explanations. He also discusses the cycle of design used by engineers to solve problems. He starts by defining a theory as a well-established explanation of a...

We’re used to competitions with clear winners and losers: baseball games, math olympiads, pie-eating contests, and games involving thrones. We crown a victor and everyone else goes home empty-handed! In business, though, there isn’t just...

Paul Andersen introduces the concept of bioenergetics. He explains how living organisms utilize free energy in the Universe. He begins with a brief discussion of thermodynamics and Gibbs free energy. He then explains how reactions can...

Remember pre-school? If not, IT WAS SO MUCH EASIER! But when you were stacking blocks and figuring out which block went into which shaped hole, you were learning about properties. In this episode of Crash Course Kids, Sabrina talks about...

There are a number of stereotypes about bipolar disorder, but they stray pretty far from what the reality is—especially since there are multiple subtypes that all have their own sets of symptoms.

We’ve had a number of false starts that did more harm than good to figure out new treatments, and ECT is one of those treatments that came from a complicated history.

Paul Andersen teams up with Keith Hughes to explain why teaching evolution is not optional for high school biology teachers.

It was long assumed that Amazons, the fierce and fearsome women warriors of Greece, were imaginary. But curiously enough, stories from ancient Egypt, Persia, the Middle East, Central Asia, India and China also featured Amazon-like...