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Human ancestors in Africa likely had dark skin, which is produced by an abundance of the pigment eumelanin in skin cells. In the high ultraviolet (UV) environment of sub-Saharan Africa, darker skin offers protection from the damaging effects of UV radiation. Dr. Jablonski explains that the variation in skin color that evolved since human ancestors migrated out of Africa can be explained by the tradeoff between protection from UV and the need for some UV absorption for the production of vitamin D.
(Source: DCMP)
Are you at risk for skin cancer? What are you doing to prevent it? How effective are sunscreens? Answers these questions and shows what melanoma can look like and how to spot it. Talks about the different types of skin cancer (basal cell carcinoma, squamous cell carcinoma, and melanoma) and treatment options. Discusses ways to maintain healthy skin.
Students learn and explore the major features of the skin, skeletal, and muscular systems. Special attention is given to the care and maintenance of skin, skeletal, and muscular systems. Concepts and terminology include: integumentary system, layers of skin, sweat glands, bone, osteocytes, periosteum, marrow, cartilage, ossification, types of joints, ligaments, types of muscle tissue, and voluntary and involuntary muscle.
Presents sensory receptors that depend on contact with the immediate world: taste buds, touch sensors, and olfactory cells. These receptors lie in the skin, the largest organ of the body, which also senses heat, pain, and pressure. Re-creates the complex world of the skin through realistic models and photographs.
Introduces the social and health aspects of good personal hygiene. Demonstrates the correct way to wash hands and bathe, as well as how to take care of hair and nails. Discusses the importance of wearing sunscreen, protecting skin from bumps, bites and itches, and keeping hair and nails clean and groomed.
When the nerve cells of squid suffer an injury, something unexpected happens with the tiny pouches of colored pigment, called chromatophores. A MIT scientist discusses this phenomenon, and how it can be used and modeled on the computer with some surprisingly simple rules. Part of the "Science Out Loud" series.
In this behind-the-scenes glimpse into the platypus collection at The Field Museum, host Emily Graslie examines various skeletons. Bill Stanley, Director of the Gantz Family Collections Center, describes the various anatomical structures of the platypus. Part of "The Brain Scoop" series.
New research reveals that loss of sleep leads to increased anger. Researchers are now studying the link between loss of sleep and aggressive behavior. Other segments include bacteria that consume greenhouse gases, a handy robot glove, and drones mapping marine megafauna. Part of the "4 Awesome Discoveries You Probably Didn't Hear About This Week" series.
When Brandon was 10 he was diagnosed with psoriasis. At first, he was very ashamed due to the visible patches on his skin. However, five years after his diagnosis, with adequate treatment, he lives with the disease and has a normal life.
Wine making has become a sophisticated scientific process, from the grafting of two different types of vines, to making growing possible anywhere in the world, to the technology used to create a red or a white. Every step is precisely thought out. Part of the "Science to Go With Dr. Joe Schwarcz" series.
Addresses how puberty begins, what changes to expect during this developmental period, and how to cope with them. This introductory video is designed to be viewed by both boys and girls together.
Where do bacteria live, and how long have they been here? How can you tell them apart? What do they do to people and the environment? Answers these and other questions in this overview. Examines the fundamental structure of the bacteria cell, types of bacteria, and their importance to humans and the environment.
This demonstration uses a water balloon to show how Earth's oceans are absorbing most of the heat in the atmosphere. The trapped heat in the ocean is warming the planet. Part of the “DIY Space Classroom Activities” series.
Host Trace Dominguez learns about taxidermy and how museums ensure specimens in collections are preserved. He interviews a taxidermist, and she discusses some of the techniques and procedures used to ensure that the specimen will not decay and remain as realistic as possible.
Today's optoelectronic engineers are developing extremely thin glass that is both durable and scratch-resistant. Telecommunications systems require speed and accuracy, and glass is proving to be important in developing semiconductors, optical fibers, and multiplexing. Precisely engineered glass is also used in terrestrial and extra-terrestrial telescopes.
Viruses are tiny agents that can infect a variety of living organisms, including bacteria, plants, and animals. The Dengue virus is a mosquito-borne viral disease occurring in tropical and subtropical areas. Scientists at the University of California, Berkley have identified a key culprit responsible for the severe symptoms related to Dengue fever.
Offers commonsense tips and step-by-step demonstrations on dog care as an alternative to high veterinary bills. Highlights include: toenail maintenance; treating infections and cuts; eye, teeth, and ear care; dry and itchy skin; and dietary considerations. NOTE: Demonstrates how to empty anal glands.
The body's best offense against microorganisms is its immune system. But what is it and how does it work? Why does it sometimes work against us? Discusses the non-specific (skin, tears, saliva, mucus, stomach acid) and specific (lymphatic system, spleen, thymus, bone marrow) defenses that keeps us healthy. Describes some autoimmune diseases and various marrow-produced cells.
A key moment in the evolutionary saga occurred 200 million years ago, when the ferocious reptile-like animals that roamed the Earth were in the process of evolving into shrew-like mammals. But these reptilian ancestors left their mark on many parts of the human body, including skin, teeth and ears. Part of the “Your Inner Fish” series.
Follows a family's unplanned Cesarean birth from early labor through recovery. An obstetrician explains the Cesarean procedure and discusses ways to minimize risk. Shows the surgical procedure using 3-D animation. Presents information on breast-feeding and recovery, and how to make a Cesarean birth a fulfilling experience. NOTE: Concludes with graphic footage of an actual Cesarean surgery.
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Biology related concepts
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