Every day, humans literally flush a valuable resource down the toilet: nitrogen. But there are some animals that have figured out a way to recycle the extra nitrogen in their bodies by moving it not to their livers, but to their mouths!

Hank takes us through the bowels of the human digestive system and explains why it's all about surface area.

Constantly churning inside of you, the digestive system performs a daily marvel: it transforms your food into the vital nutrients that sustain your body and ensure your survival. Emma Bryce traces food's nine-meter-long, 40-hour journey...

Mmmm! The smell of a batch of cookies straight out of the oven is enough to make your mouth water! But have you ever wondered why your mouth waters?! Jessi and Squeaks are here to tell you all about saliva and the many ways it helps you...

It goes on some of our favorite foods, and it can even make our least favorite foods taste better. Yes, we're talking about melted cheese.

It’s become a common belief worldwide that gulping down a glass of milk will make you phlegmy. But... there seems to be no real scientific evidence to back up that claim.

Spit is critical for our health. Actually.

Hank begins a series of videos on organ systems with a look at the nervous system and all of the things that it is responsible for in the body.

Find out why these arachnids are among the least B of humanity's BFFs. Yeah, they're blood-sucking parasites, but that's not all of it!

There are a few animals that will instinctively lick their wounds when injured. SciShow Quick Questions explores the reasons why they do this, and why we sometimes have to stop them from doing it.

Why Do Mosquito Bites Itch?

Descomposición mecánica y química del alimento en el organismo para obtener sustancias químicas más simples que se puedan absorber y utilizar en el metabolismo. <br/<br/>>

Twig - Biología

Órgano que produce una sustancia específica que necesita el organismo, como una hormona. <br/<br/>>

Twig - Biología

El sabor: instinto de supervivencia. Instintivamente rechazamos los sabores amargos y ácidos por si la comida está pasada o es venenosa. Introducción a la lengua y cómo nos ayuda a saborear.
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Estudio de caso del rol de los intestinos en la digestión.
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Water is a simple molecule, so our body does not have to break it into smaller, simpler molecules to digest it. In fact, water molecules are so small that they have no problem diffusing through the cell membrane. This cell membrane...

The digestive system is the system that helps us break down the food we eat to its basic nutrients so that our body can use those nutrients to get energy. The digestive system is composed of the long continuous alimentary tract or...

An organ that produces a specific substance the body needs, such as a hormone.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions....

The use of a wide range of scientific techniques to collect and store evidence for criminal investigations.
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A Twig Science
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Key scientific terms defined in just 60 seconds using stunning images and...

Amazing facts about digestive organs. Find out what they are, how they work, and how some animals' are different.
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The mechanical and chemical breakdown of food in the body into simpler chemicals that can be absorbed and used in its metabolism.
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Key scientific terms defined in just 60 seconds...

Taste is a survival instinct: we instinctively dislike bitter or sour tastes in case food is off or poisonous. An introduction to the tongue and how it helps us to taste. Biology - Being Human - Learning Points. Taste is a survival...

Follow the incredible journey of food inside the body.
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