The older the word, the longer (and more fascinating) the story. With roots in Old English, 'true' shares etymological ancestors with words like betroth and truce...but also with the word tree. In fact, trees have been metaphors for...

Back in the day, bacterial diseases like dysentery were super deadly, but the nomadic people in northern Africa had long known about an effective, if hard to swallow, cure.

In the Pacific Ocean, there lives a fish that's . . . a little different. Hank tells you all about the Pacific barreleye fish!

Today, we all do our best to protect ourselves from coronaviruses. But a lot of what people are doing doesn’t really help, and it could take away supplies from those who actually need them. Hank explains what does help, and how it...

A beautiful proof of why slicing a cone gives an ellipse.

We all have really different looking locks but what actually make our hair straight or curly?

If you shave regularly, you may have noticed your razor blades don’t cut as well after just a few uses. But why do razors get dull so quickly?

Sitting down for brief periods can help us recover from stress or recuperate from exercise. But nowadays, our lifestyles make us sit much more than we move around. Are our bodies built for such a sedentary existence? Murat Dalkilin�c...

Hank discusses some new research that studied what makes us unhappy with ourselves and with other people, focusing on homophobia and consumerism.

Continuing in our journey of understanding motion, direction, and velocity... today, Shini introduces the ideas of Vectors and Scalars so we can better understand how to figure out motion in 2 Dimensions. But what does that have to do...

Mr. Andersen shows you how to interpret a position vs. time graph for an object with constant velocity. The slope of the line is used to find the velocity. A phet simulation is also included.

A beautiful proof of why slicing a cone gives an ellipse.

A beautiful proof of why slicing a cone gives an ellipse.

Wind is everywhere. The air is constantly moving, sometimes gently, sometimes violently. Why? Pressure, temperature and rotation come together to make wind. Here's how.

If you've spent any time trying to explode a pumpkin with rubber bands you know that they have a distinct smell to them when stretched, and you have physics to thank for that.

In a word, "yes" - space is packed with gravity. Hank explains how Isaac Newton described how gravity works, and why even though it seems that things are floating in space, they're still effected by gravity. Every object in the universe...

In this edition of IDTIMWYTIM, Hank addresses the so-called centrifugal force, and explains why you really mean centripetal force.

In this video Paul Andersen explains how light can be refracted, or bent, as it moves from one medium to another. The amount of refraction is determined by the angle of incidence and the index of refraction. Snell's Law can be used to...

True Pines (conifer trees in the genus Pinus) are often confused with other members of the Pinaceae family like Picea (Spruces), Abies (Firs), Pseudotsuga (Douglas-firs) or Larix (Larches). So is very likely that your Christmas tree is...

Ever wonder why we have seasons? A lot of people think it's because the Earth gets further away from the sun in winter, and closer in the summer. But, it's actually more interesting than that. In this episode of Crash Course Kids,...

Has anyone ever told you, "Stand up straight!" or scolded you for slouching at a family dinner? Comments like that might be annoying"but they're not wrong. Your posture is the foundation for every movement your body makes and can...

In this video, we explore the origins of the names of the months and their meanings. From January, named after the Roman God Janice, to December, known as after Yule or after a yaola in Old English, we uncover the fascinating history...

In this lesson we explore why the electric field between two ideal parallel plates is uniform and always directed from the positive plate to the negative plate. Using Coulomb’s law, symmetry arguments, and clear step by step reasoning,...

🎉 Welcome to a Magical Celebration! 🏮🧩 "Riddles for kids for Lunar New Year and Lantern Festival" 🎊



Join the festive fun as we dive into the heartwarming traditions of Lunar New Year and the enchanting Lantern...