With so many harmful agents around us, how do humans stay healthy? Find out by watching an informative video from a larger biology playlist that details our defenses against a variety of pathogens. The narrator describes the body...

Listen and watch as two young acrobats sing about, and point to body parts—head, knees, mouth, nose, and more! 

Caffeine is a mild stimulant for the nervous system and in moderation, is not harmful to the body. The narrator discusses sources of caffeine, its chemical make-up, and what it does inside the human body. He also shares the recommended...

Ligaments are the tough, fibrous connecting tissue between bones that form joints. Explore this connecting tissue with the 20th video in a series of 47 videos on the human body. The narrator first reviews the anatomy of the skeleton...

Sounds travel into our ears at 770 mph. Teach class members about our sense of hearing and how this helps with balance. Learners explore sound as it travels from the air into our ears and is translated by the brain. They then see how...

The average human body loses 40–100 strands of hair in one day. This is the first video in a series of 47 and introduces scholars to anatomy and physiology, the study of the human body, and how it works. The narrator shares the history...

If it's on the Internet, it has to be true... right? Turns out the answer is a predictable no. While you don't have a new body every seven years, your cells do replace themselves and the video discusses how often based on the types of...

A hypnagogic jerk, or hypnic jerk, is when you startle yourself awake just as you are drifting off to sleep. The video describes what a hypnic jerk is, how common they are, and who typically experience them. Viewers are offered two...

There are six different types or classifications of scars. Learn about each and their differences with a video that utilizes high-quality photographs to detail the similarities and differences.The resource also focuses on treatment...

There is a law in Haiti that makes it a crime to turn someone into a zombie. But is such a thing even possible? Scholars see examples of zombie-like organisms found here on Earth with a video that explores numerous examples, from...

Most animals that show a paw preference are split 50/50 with half of the population preferring one side and the other half preferring the other, yet in humans only 10 percent are left-handed. The video explains what part of the brain...

Trained dogs are much better at detecting some types of cancer than any test humans have created. The video explains weird ways of diagnosing illnesses. It covers having a dog sniff you for cancer, smelling your breath, tasting...

Smokers are 70 percent more likely to develop hearing loss than non-smokers. Avideo skips the common side effects of smoking and explains five less obvious reasons not to smoke. It touches upon physical appearance, pet health, and others.

You are an entire biome! A video explain the many parasites that inhabit your body. It begins with the good, beneficial bacteria and mutualism. Then it covers the symbiotic relationships and concludes with the bad ones.

Vestigial structures no longer perform their original function but are still found in many species. A video discusses the appendix, tail bone, wisdom teeth, and more. It explains the original purpose, the current purpose, and connections...

Hormones, genetics, food—how exactly do people get acne? The bigger questions is how do you get rid of acne? Watch an interesting video that explains the different causes and treatments of acne.

While our outsides are mostly symmetrical, our internal organs aren't. Why would this be the case? Are other animals the same? What determines if your organs are on the "correct" side or backwards? Here's a video that answers these...

Do you know what Sonic hedgehog is? Yes, it is a video game character, but it is also a protein that controls how your fingers develop. A paleontologist discusses the development of the arm and hand, beginning with fish and ending...

Lobsters can regrow limbs, a trick humans can't do; however, according to this video, the placement of the spine and organs on the dorsal and ventral sides of a lobster is similar to the human body plan. The video also includes the...

Our bodies can produce up to three liters of sweat per hour. But why do we sweat and exactly how does the biological process work? This video covers a few topics of science about being outside in the heat, explains ways to cool down...

When you have to flow, you have to flow. The lesson introduces class members to microfluidic devices and their uses in medicine. They watch a short video on how the diameter affects the rate of flow. The worksheet has individuals...

Take two pills and call me in the morning. The first lesson in a short unit of four introduces class members to delivery methods of medicines. The instruction introduces the question of which delivery method is best to get you feeling...

Though UV radiation can damage skin, it isn't all bad. The third installment in a six-part series allows the class to study the structure and function of skin. They learn about the different types of skin cancer and the SPF rating...

Just thinking, reading about, hearing the word, or seeing someone yawning will make you yawn. But why? In a video that explores some involuntary behaviors viewers see why we yawn, why our eyes twitch, why we hiccup, why we sneeze...