Be Smart
5 Weird Involuntary Behaviors Explained!
Our bodies do a lot of weird things, and many of them are completely involuntary. Why do we often jerk our bodies awake right before falling asleep? Why do we yawn? Why do we hiccup? Why do some people sneeze when they look at the sun?...
SciShow Kids
Why Do We Get Hiccups?
Hiccups can be really annoying and hard to get rid of, but do you know why they happen? Find out the answer and learn more about how your lungs work at the same time on today's SciShow Kids!
SciShow
The Fog That Killed 12,000 People
How can smog affect the life expectancy of people? Scientists have investigated the causes and repercussions of The Great Smog of London in 1952, and continue to study the effects of air pollution around the world today.
SciShow
The Only Animal That Can't Breathe Oxygen
Oxygen is so essential for animals that every multicellular species we’ve ever studied has the ability to use oxygen to create energy... except one.
SciShow
What Ventilators Taught Us About Breathing
Humans’ experiences with ventilators have taught us that sighing isn’t just a way to express yourself: it’s a vital part of our everyday breathing.
SciShow
3 Animals That Breathe Through Their Butts
If you want to be able to breathe underwater, you're going to need to get creative. So some turtles, dragonfly nymphs, and sea cucumbers decided to use their butts.
SciShow
Does Wine Really Need to 'Breathe'?
Whether it's from a box or a bottle, letting your wine 'breathe' can actually make a difference in its taste.
SciShow
The Wonderful Reason Babies Hiccup So Much
Ah, hiccups. They are typically harmless, and yet also very annoying. But why do they happen in the first place?
Crash Course
Solutions: Crash Course Chemistry
This week, Hank elaborates on why Fugu can kill you by illustrating the ideas of solutions and discussing molarity, molality, and mass percent. Also, why polar solvents dissolve polar solutes, and nonpolar solvents dissolve nonpolar...
Crash Course
Circulatory & Respiratory Systems - CrashCourse Biology
Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.
SciShow Kids
How to Feel Your Heart Beat
Get to know your body’s most important muscle -- your heart -- and learn how to take your own pulse!
TED-Ed
What's in the air you breathe? | Amy Hrdina and Jesse Kroll
Take a deep breath. In a single intake of air, your lungs swell with roughly 25 sextillion molecules, ranging from days-old compounds, to those formed billions of years in the past. In fact, many of the molecules you're breathing were...
Curated Video
The Role of Chemical Reactions in Light, Fire, and Emotions
This video explores how chemical reactions create light and power various processes, from lighting up a room to propelling a rocket into space. It also delves into the fascinating ways chemical reactions occur within our bodies,...
Curated Video
The Power of Meditation: Ancient Practice for Modern Life
This video provides a brief introduction to the ancient practice of meditation. It explains the concept of focusing the mind on one thing, often the breath, and highlights the various ways in which different religions and cultures have...
Curated Video
Hyperventilating
Breathing faster or deeper than necessary. It can happen voluntarily, or as a result of panic or excitement, or due to a medical condition. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning...
Curated Video
Alveoli
Microscopic air sacs in the lungs where gas exchange takes place between blood and the atmosphere. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...
Curated Video
Amniotic fluid
A clear, yellowish fluid that surrounds the developing foetus in the amniotic sac within the mother's womb. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
Curated Video
Adrenaline
Also called epinephrine, a hormone produced by the adrenal glands, which are found just above the kidneys. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
Curated Video
Big Breathers
Marine mammals like dolphins, seals and whales can hold their breath far longer than humans. How do they do this? Biology - Human Body - Learning Points. Underwater mammals, such as humpback whales, can hold their breaths for up to...
Curated Video
Little Breathers
Find out how humans can overcome biological responses to hold their breath underwater for several minutes. Biology - Human Body - Learning Points. When we hold our breaths, our lungs signal the brain to start breathing again. The human...
Curated Video
Pollution: Air
What are the major atmospheric pollutants and where do they come from? Discover what air pollution means for the environment and how it affects humans, from smog to acid rain. Earth Science - Human Impacts - Learning Points....
Curated Video
Acidification of Water
We use a drinking straw, some water and universal indicator to show that breathing out creates acid. Universal indicator is added to the water to show its pH value. When we blow into the water the indicator changes colour showing that...
Curated Video
The Dark Side of Oxygen
We depend on oxygen for life. But in fact, oxygen is corrosive: ageing us, damaging cell DNA, and 'rusting' us from the inside. Biology - Human Body - Learning Points. Oxygen is vital in powering every cell and process in the human body....
Curated Video
Developing Brain: Baby Brain
We assume a baby's brain is just a small version of an adult brain, but it's not at all. How babies' brains develop from birth, shaping and being shaped by the world around them. Biology - Being Human - Learning Points. The brain takes...