Light travels through space as fast as anything in the universe possibly can, but before scientists could figure out light’s speed, they had to figure out whether that speed was even finite.

Hank talks about the Maya, and helps dispel some myths about their historic civilization, revealing how, ultimately, they were just like us: smart, flawed, and awesome.

We have a garbage problem. Wouldn't it make sense to throw that trash into the nearest volcano?

COLLISIONS! A big part of physics is understanding collisions and how they're not all the same. Mass, momentum, and many other things dictate how collisions can be unique. In this episode of Crash Course Physics, Shini sits down to lead...

Your digestive system makes weird noises sometimes. You can't really stop it from happening, but you can find out why it happens in the first place!

In a series of visual, animated love letters, designer Debbie Millman reflects on the things she's grateful for by exploring the wonders of her garden, New York City, travel and storytelling. "As we navigate through this crisis, I'm...

Waves are cool. The more we learn about waves, the more we learn about a lot of things in physics. Everything from earthquakes to music! Ropes can tell us a lot about how traveling waves work so, in this episode of Crash Course Physics,...

What is the loudest possible sound? What about the quietest thing we can hear? And what do decibels measure, anyway? In this video you'll learn what makes sound

And now we return to blood vessels. In this episode, we start discussing what blood pressure is, how it can become "high", and what that means for our health. One of the more interesting points is that your body has ways of...

Avalanches can be powerful and dangerous, but not all of them are created equal, and not everything you've seen on TV is likely to actually set one off.

Sound waves vibrate more than just our eardrums, they can also make visual art!

Sam the Bat is visiting today, and Jessi wants to use a cool trick to show him how we use a special part of our body to sing.

Stradivarius are synonymous with quality, but how we can replicate their sound is a mystery!

Mr. Andersen explains how sound waves are created and perceived. A brief discussion of pitch and loudness are included. A generated sound of varying pitches is also included.

Humanity has long been looking at the universe and asking the big questions: How did it begin? How will it end? Cosmologists are searching hard for the answers, but where do they even start? The answer is light. Pete Edwards outlines the...

If you’ve ever looked at a frog’s head, you might have noticed that they don’t have external ears. So How do they hear?

You're on a flight, and the drone of the engines is getting on your nerves, so you pop on a pair of noise-canceling headphones, and sweet, blessed silence descends. But those headphones aren't just muffling the sound -- they're actually...

Biodiversity is the key to life on Earth and reviving our damaged planet, says ecologist Thomas Crowther. Sharing the inside story of his headline-making research on reforestation, which led to the UN's viral Trillion Trees Campaign,...

The world is a living tapestry ... As the weave of life is torn apart in one place, the threads unravel in another, says author and physics professor Vandana Singh, acknowledging humanity's interconnectedness with the planet -- and the...

You may have had an ultrasound before, and wondered what that gel does. Well, that weird alien goop has a purpose, and it has to do with being like our weird human skin.

Squeaks is feeling a little under the weather! As if a sore throat and a stuffy head weren't bad enough, he also has an earache. Join him to learn why we get earaches and what we can do to help our bodies get over them faster!

Have you ever felt like you're talking, but nobody is listening? Here's Julian Treasure to help. In this useful talk, the sound expert demonstrates the how-to's of powerful speaking -- from some handy vocal exercises to tips on how to...

In this video Paul Andersen explains how standing waves are created through the reflection and interference of traveling waves. Destructive interference creates areas of no movement called nodes. Constructive interference creates areas...

Silence is a rare commodity these days. There's traffic, construction, air-conditioning, your neighbor's lawnmower ... and all this unwanted sound can have a surprising impact on your health, says noise researcher Mathias Basner....