Biology connects all of life—all of YOUR life. In the final episode of Crash Course Biology, Dr. Sammy is taking your questions. No matter how big, small, or personal, biology is in them all! He’ll show us how biology can help us solve...

An upcoming project deadline, a fight with a family member, or even an embarrassing moment can easily trigger our body’s stress response. While we can’t always control what life throws at us, there are ways to better prepare for...

Did you know that your body's fight-or-flight response to danger may, in part, come from inside your bones? Plus, another study suggests that vaping may impair to your ability to fight off lung infections.

Hank tries not to stress you out too much as he delves into the functions and terminology of your sympathetic nervous system.


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Sympathetic Nervous System Controls the Bo
dy's Stress...

Stress and anxiety are complex, and the brain chemistry involved in those experiences are no exception. Here we explore the chemicals responsible for your brain’s response to stress.

Cognitive researcher Nancy Etcoff looks at happiness -- the ways we try to achieve and increase it, the way it's untethered to our real circumstances, and its surprising effect on our bodies.

Stress. It makes your heart pound, your breathing quicken and your forehead sweat. But while stress has been made into a public health enemy, new research suggests that stress may only be bad for you if you believe that to be the case....

Trusting your gut may not sound like a reliable way to make decisions, but the research points to some times when you might want to listen to it!

Did you know that your body's fight-or-flight response to danger may, in part, come from inside your bones? Plus, another study suggests that vaping may impair to your ability to fight off lung infections.

We can’t avoid having stress, and that’s not always a bad thing. But if you are dealing with a lot of stress every day, it might cause you physical harm.

Hank begins teaching you about your endocrine system by explaining how it uses glands to produce hormones. These hormones are either amino-acid based and water soluble, or steroidal and lipid-soluble, and may target many types of...

In this science project, you will learn how breathing techniques can improve your body's stress response to prepare for space flight.

This video explores the true nature of mental resilience and challenges the idea that positivity alone builds a strong mind. Discover how the mind-brain connection influences our thoughts, emotions, and stress responses. Learn practical...

This video addresses why some people engage in repetitive physical behaviors such as knuckle cracking and leg shaking. It examines the biological and psychological triggers behind these actions and reassures that, while potentially...

When you feel overwhelmed by all the things you need to do, it can freeze you into not doing any of them. This will only make the situation worse. So, you need to seize control. And there's the way. It's my Overwhelm Routine.

Treating Trauma: Expert Insights on Top 3 Therapies

This video discusses the physiological response to stress, including the activation of the sympathetic nervous system and the release of cortisol. It explores how these responses evolved to deal with primitive stressors and how they can...

ENGLISH VOCABULARY WORDS. Do you want to learn English? Are you looking for an English lesson on vocabulary and pronunciation? Learning English vocabulary and pronunciation are my specialties! In this video, I’ll teach you the precise...

n this video, we explore the functions of the major glucocorticoid, cortisol, and how it is released.

Jason Weeks and Steve Platts discuss the ways NASA is collecting radiation data to better understand the risks and possible mitigation strategies for humans traveling through deep space. This is the last in a six part series on NASA’s...

Humans, just like most other mammals, display a wide variety of emotional states. But what are emotions? Why do we have them? What purpose do they serve in an evolutionary context? Let's get to the bottom of emotions right now!