28 September 2014, 08:44 PM ET
Properties and uses of the element oxygen.
26 September 2014, 06:36 PM ET
Quantum mechanics is the body of scientific laws that describe the wacky behavior of photons, electrons and the other particles that make up the universe.
26 September 2014, 06:02 PM ET
More than 90 percent of Americans have a cataract by age 65.
26 September 2014, 05:05 PM ET
How to prepare for a hurricane, from supplies to emergency evacuation plans.
26 September 2014, 01:13 AM ET
Where they live, what they eat and conservation measures.
25 September 2014, 08:38 PM ET
Occupational therapists help patients conduct the activities of daily life that give them meaning.
25 September 2014, 06:56 PM ET
These endangered beasts are the largest land animals on Earth.
25 September 2014, 06:02 PM ET
Faults are categorized into three general groups based on the sense of slip or movement. Descriptions of the three types of faults that cause earthquakes.
25 September 2014, 01:01 AM ET
Biomedical engineering is the integration of biology, medicine and engineering to develop systems and devices to improve health care.
24 September 2014, 06:20 PM ET
Apples are low in calories and high in fiber, have only a trace of sodium and no fat. An apple a day may really keep the doctor away.
24 September 2014, 05:35 PM ET
They're one of the greatest endangered species success stories.
22 September 2014, 07:27 PM ET
Fibromyalgia is a chronic condition characterized by fatigue and widespread pain in muscles and joints. It affects more women than men.
22 September 2014, 04:30 PM ET
Penguins are torpedo-shaped, flightless birds that live in the southern regions of the Earth.
20 September 2014, 01:05 AM ET
Aerodynamics is the study of how gases interact with moving bodies, especially aircraft and automobiles.
19 September 2014, 10:15 PM ET
The seasonal flu shot is a yearly vaccine administered to protect against the flu, or influenza. In the United States, flu shots are recommended for everyone ages 6 months and older.
19 September 2014, 08:19 PM ET
What's behind the percussive symphony? And is it okay to crack your knuckles?
18 September 2014, 06:59 PM ET
Spinal stenosis is a narrowing of the spinal canal. As the canal narrows, it puts pressure on the spinal cord or nerve roots, causing pain, numbness or other problems.
18 September 2014, 02:03 PM ET
Flamingos are large birds with long necks, sticklike legs and pink or reddish feathers. The colors of the feathers come from pigments found in their food.
17 September 2014, 09:54 PM ET
A variety of healthy foods and beverages helps a mother-to-be provide the important nutrients a baby needs for growth and development.
17 September 2014, 07:39 PM ET
Rheumatoid arthritis is a chronic disease in which the immune system attacks the joints.
17 September 2014, 04:22 PM ET
Ostriches are large, flightless birds that live in the dry, hot savannas and woodlands of Africa.
16 September 2014, 07:35 PM ET
Restless legs syndrome (RLS) is a disorder characterized by an intense urge to move the legs. The impulse can be so strong that an individual is unable to resist.
16 September 2014, 05:53 PM ET
On the Big Island of Hawaii, one of the world's most active volcanoes has been spewing lava since 1983.
16 September 2014, 11:41 AM ET
Properties, sources and uses of the element silicon.
15 September 2014, 09:04 PM ET
Chronic fatigue syndrome is a puzzling medical condition characterized by extreme fatigue, impaired memory, joint and muscle pain, tender lymph nodes, and sore throat.
12 September 2014, 06:39 PM ET
Lupus is a chronic disorder in which the immune system attacks otherwise healthy cells. It is characterized by fatigue, joint pain and rashes.
12 September 2014, 06:28 PM ET
Working out while pregnant is safe, and has benefits for both the mother and baby.
12 September 2014, 01:20 AM ET
Structural engineering deals with the framework of structures, making sure they can withstand the stresses of their environment and remain safe, stable and secure.
12 September 2014, 12:48 AM ET
Classical mechanics is the mathematical study of the motion of everyday objects and the forces that affect them.
11 September 2014, 07:41 PM ET
Also called ‘gouty arthritis,’ gout is a painful form of arthritis caused by too much uric acid in the blood. Learn about causes, symptoms and treatment.
09 September 2014, 05:44 PM ET
Carpal tunnel syndrome is a nerve-related condition that causes pain and numbness in the wrists and hands.
09 September 2014, 01:41 AM ET
Nuclear engineering deals with harnessing the energy released from nuclear reactions. Nuclear engineers work in power production, weapons manufacturing, food production, medical technology and other fields.