For us terrestrial animals, sneezing is a regular part of life involving the movement of a lot of air. But animals that live underwater and don't breathe air like we do also sneeze. Sea sponges, corals, and hagfish use their snot to...

After a tough gym sesh, your muscles are likely pretty sore—that means they're growing right? Find out about what's actually happening in your body when your muscles are sore on this new episode of SciShow! Let's go! Hosted by: Hank Green.

Is it a fuzzy sock? An overripe banana? A moldy tube of toothpaste? In fact, it’s a humble sea cucumber: a brainless, fleshy form surrounding a digestive tract, and bookended by a mouth and an anus. And while it might look odd, its daily...

You hit the gym for the first time forever and now you can barely move... that means you're getting totally ripped, right? Maybe! Find out on this week's QQ!

In the 16th century, physician Andreas Vesalius described how a suffocating animal could be kept alive by inserting a tube into its trachea and blowing air to inflate its lungs. Today, Vesalius’s treatise is recognized as the first...

Way out in the solar system, the heat of the Sun drops off dramatically, so the gas giants get just a tiny percent of the solar radiation that reaches Earth. Instead, their weather is fueled from the inside out!

This video is about how Russian physicist Aleksandr Fridman corrected Albert Einstein about the expansion of the universe. Einstein thought that general relativity implied that space had to be static and...

We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process...

Howcast - Let belly dancer Irina Akulenko teach you how to do a belly roll in this belly dancing video from Howcast.

Howcast - Let belly dancer Irina Akulenko teach you how to do the belly dance move known as a belly isolation in this Howcast video.

Howcast - Let belly dancer Irina Akulenko teach you how to do the belly dance move known as the traveling undulation in this Howcast video.

Howcast - Let belly dancer Irina Akulenko teach you how to do the belly dance move known as the traveling reverse undulation in this Howcast dance video.

Howcast - Let belly dancer Irina Akulenko teach you how to do the belly dance move known as a reverse horizontal figure 8 in this Howcast video.

Howcast - Learn how to do pelvic floor exercises with a ball for a post-baby workout from personal trainer Erin Sharoni in this Howcast workout video.

Howcast - Learn how to do a dumbbell bend from certified personal trainer James Rizzo in this home ab workout video from Howcast.

Products that a manufactured and sold in different nations are subject to international agreement. This video explains what are International Contracts and how do they work. Also, this video explains what are the important considerations...

Everything you need to know to get a basic understanding of heart sounds. I cover S1, S2, S3, and S4, what leads to those sounds as well as Systolic and Diastolic murmurs.

This video explains how the human body responds to exercise and the increased demand for energy that comes with it. The role of cellular respiration, glucose, and oxygen in supplying energy to the muscles is explained. The video also...

In this video, the speaker discusses the various theories surrounding side stitches, or exercise-related transient abdominal pain (ETAP). Using a cadaver to demonstrate the anatomy of the abdominal cavity, the speaker explores the...

Dr. Nicolaes Tulp gives us an anatomy lessons on muscles and the felxor digitorum.

Wai Lana helps you focus on poses to strengthen your abs, back, and thighs. This will ensure that you can carry your growing infant without experiencing back pain.

In this video, I demonstrate and explain correct technique for quad sets and the straight leg raise (SLR) along with one good progression of the exercise.

n this video, I explain the abdominal reflex. More specifically, we discuss the reflex arc and how to determine whether or not the reflex is present/normal or abnormal.

In this video, the CEO of a professional services firm shares her journey from being an intern to starting her own WBE consulting firm, leveraging the set asides for female and minority firms. She talks about the importance of...