Units are a major way we describe the world around us, and by looking at the scientists some of them are named after, we can get a sense of how we’ve learned so much about our universe.

Scientists dissect the human scream for the first time, and also re-think what was thought to be the biggest dinosaur in the world.

We all know ducks quack, dogs bark, and birds chirp, but that barely scratches the surface of all the amazing ways animals have devised to talk to each other!

Many ancient sites had some truly amazing effects on sound waves, suggesting that early cultures may have built spaces to evoke certain sensation. And by studying the acoustics of these structures, we can learn new things...

Scientists dissect the human scream for the first time, and also re-think what was thought to be the biggest dinosaur in the world.

Sounds that animals make can be really different, and it turns out that there's a reason why some species communicate with certain sounds.

It's okay to be small?

In a dark cave, bats can't see much. But even with their eyes shut, they can navigate rocky topography at incredible speeds. This is because bats aren't just guided by their eyes, but rather, by their ears. It may seem impossible to see...

You’re in the woods, there’s a full moon, and the wind begins to howl. We can’t take you out of this horror movie scenario, but we can explain why the wind sounds so spooky.

Units are a major way we describe the world around us, and by looking at the scientists some of them are named after, we can get a sense of how we’ve learned so much about our universe.

Radio, Cinema, and Television have been staples in news coverage, entertainment, and education for almost 100 years. But... where did they all come from? Who started what and when and why? In this episode, Hank Green talks to us about...

In this video Paul Andersen explains how the period is the time between wave and the frequency is the number of waves per second. Period is measured in seconds and frequency is measured in Hertz. Wave period and wave frequency are...

It's an old cliche: an opera singer hits a note so high, it breaks a wine glass. It may seem over the top, but with a little science (and an amp), you too can break a glass like the finest soprano!

A bisected grape in the microwave makes plasma. But how does it work? A grape is the right size and refractive index to trap microwaves inside it. When you place two (or two halves) close together the fields interact with each other...

Frequency is the measurement of the total number of complete cycles or oscillations that a wave goes through in one second, and it is expressed in hertz (Hz). Frequency is a fundamental attribute that dictates the rate at which a wave...

A unit for measuring frequency, equal to one thousand hertz or cycles per second.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

The rate at which a repeating event occurs, usually measured in counts per unit time.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

An electric current in which the flow of electric charge periodically changes direction.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual...

The SI unit of frequency, one hertz is equal to one cycle per second.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...

Humans can only hear a certain range of sound frequencies. Discover the sounds we can't hear and why they can be useful. Physics - Waves - Learning Points. The frequency of sound waves determines whether we can hear them. High-frequency...

We have sent messages around the world and into space, but communicating underwater remains a challenge. How and why do radio waves allow us to talk to submarines? Physics - Waves - Learning Points. Salt water absorbs sound waves making...

Sounds can vary greatly: extremely quiet or deafeningly loud, high and shrill to low and booming. Why are they so different? Physics - Waves - Learning Points. Sound is a vibration passed to and fro along particles forming a wave. It can...

We use a sounding board called a sonometer to investigate how the pitch of sound changes when the length of wire being plucked changes. We change the position of a moveable bridge to change the length of the wire and discover that...

Ride into 'Waves' to discover the powerful forces that shape our oceans, sounds, and even light! It's a splashing journey into the science of waves, made simple and fun for kids.