Health

In this video, we’ll break down what body image means and share simple, practical ways to improve how you feel about your body.

Learn about how stress affects the brain and the resilience scale in this scientifically-based video.

Check out this slide show to get an explanation of the various parts of the female reproductive system.

This four minute animated video presents the core story of brain development. Learn how childhood experiences can affect our brains and how we sometimes need our brains to function like 'air traffic control'.

Learn about the stages of our immune response, the types of cell and the difference between our innate immune system and our adaptive immune system - and why vaccines are key to helping our adaptive immune system fight disease - in this short explainer video.

This 6-minute video is a visual and musical journey of the human auditory system. Human's ability to hear is explained with beasts and storms and strange faceless dancing humans armed with larger-than-life ossicles.

This site provides illustrations of the structures and functions of several human body systems, including circulatory, muscular, nervous, respiratory and urinary. Each section includes labeled diagrams, short answer and multiple choice quizzes.

Check out this human brain atlas using data from thousands of people, using the same imaging techniques neuroscientists use (MRIs and PET scans) to see inside the human brain.

After a concert, you find it difficult to hear your friend rave about the show because of the ringing in your ears. What caused these symptoms? And can you go to concerts without damaging your ears?

Explore how scientists are developing a flu vaccine that would protect you against every strain— even ones that don’t exist yet. Related Lesson

This 4-minute video from SciShow explains the science of honey's bacteria-killing power. Related Lesson

When we are cut or wounded, our skin begins to repair itself through a complex, well-coordinated process. Related Lesson

If you lined up all the blood vessels in your body, they’d be 60 thousand miles long. And every day, they carry the equivalent of over two thousand gallons of blood to the body’s tissues.

Bones might seem rock-solid, but they’re actually quite porous inside. Most of the large bones of your skeleton have a hollow core filled with soft bone marrow. What does bone marrow do? Related Lesson

Bill Schutt explains the history of the life-saving procedure. Related Lesson

Most of the time, you won't notice it's there, but over the course of your life your immune system will guard you against hundreds of potentially fatal threats. Related Lesson

When you breathe, oxygen goes to the body’s cells, while also clearing your system of the carbon dioxide. How does this happen? Related Lesson

Why do scars look different from the rest of our skin? And why do they stick around for so long after the incident that caused them? Related Lesson

Emma Bryce details how kidneys balance the amount of fluid in your body, detect waste in your blood, and know when to release the vitamins, minerals, and hormones you need to stay alive. Related Lesson

This video explores the balance of microbes in our digestive system and how bacteria can break down food the body can’t digest, produce important nutrients, regulate the immune system, and protect against harmful germs. Related Lesson

Can you grow a human bone outside the human body? The answer may soon be yes. Learn about the innovations that scientists are using to replicate that process in a lab.

Originally discovered by accident, X-rays are now used about 100 million times a year in clinics around the world. How do X-rays work? This video describes the history and mechanics of the X-ray machine and CT scanners. Related Lesson

Comprised of ten organs covering nine meters, the digestive system is one of the most complicated systems in the body. Related Lesson

Your muscular system is a network of over 650 muscles that covers the body and is the reason we can blink, smile, run, jump, and stand upright. This video heads into the human body to see how our muscular system works. Related Lesson

We live in homes with over 100,000 microscopic species, each with its own set of unique traits and capabilities. Can humans harness these microbial capabilities to create beneficial applications and new technology? Related Lesson

Oxygen forms about 21% of the air around us. In your body, oxygen forms a vital role in the production of energy in most cells. But if gases can only efficiently diffuse across tiny distances, how does oxygen reach the cells deep inside your body? Related Lesson

Discover how pregnancy changes every organ in the body— from the heart, to the brain and kidneys— and what we still don’t know about it. Related Lesson

Allison Ramsey and Mary Staicu detail the discovery of penicillin and how it transformed medicine. Related Lesson

Why should we stop slouching? Your posture is the foundation for every movement your body makes and can determine how well your body adapts to the stresses on it.

Body odor is a surprisingly complex phenomenon, influenced by our genetic makeup, age, diet, and hygiene. So what is this odor, exactly?

In about half of the human population, yeast in our hair causes dandruff. So, why do some people have more dandruff than others? And how can it be treated? Related Lesson

What is insomnia? And is there any way to break the cycle? Dan Kwartler details the science of insomnia. Related Lesson

Explore the science of why opioids are addictive and what can be done to reverse the growing rates of addiction and overdose. Related Lesson

Your liver is the heaviest organ in your body, which simultaneously acts as a storehouse, a manufacturing hub, and a processing plant. Emma Bryce gives a crash course on the liver and how it helps keep us alive. Related Lesson

Beneath your ribs, you’ll find, among other things, the pancreas -- an organ that works a lot like a personal health coach. Related Lesson

Approximately seven million people around the world die from heart attacks every year. And cardiovascular disease, which causes heart attacks and other problems like strokes, is the world’s leading killer. So what causes a heart attack? Related Lesson

Strokes deprive brain cells of oxygen and are one of the most common causes of death, and a leading cause of preventable disability. But what causes strokes in the first place? Related Lesson

Explore what happens in the body during miscarriage, and learn about three common treatment options for pregnancy loss. Related Lesson

This video explains the science behind concussions. How dangerous is a concussion? The answer is complicated and lies in how the brain responds when something strikes it. Related Lesson

We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. Related Lesson

In the US, about 30 percent of adults and 66 percent of adolescents are regularly sleep-deprived. Learn about the harm that sleep depravation causes.

Human bodies aren’t built for extreme aging: our capacity is set at about 90 years. But what does aging really mean, and how does it counteract the body’s efforts to stay alive? Related Lesson

What are the evolutionary explanations for the human menstrual cycle? This video adds a unique understanding to human menstruation, pregnancy and women's health. Related Lesson

Fevers have a significant cost for your body: for every degree increase in temperature, there’s a 12.5% increase in energy required. So, why and how does your body produce a fever? Related Lesson

Explore the probability of a future pandemic and the steps we can take to reduce its destructiveness. Related Lesson

This is a video about the development and function of the teen brain. The video treats the teen brain as a computer upgrade. The video was created by TeenMentalHealth.org and is hosted on YouTube.

Leading a more active lifestyle takes time, effort, and determination, but in the end, it's really worth the shot. Here's what will happen to your body when you exercise regularly.

With each very tasteful piece of art, you kick start a drama with millions of deaths, grand sacrifices and your immune system stepping in to protect you from yourself.