01 October 2014, 10:43 PM ET
A mirror image is the result of light rays bounding off a reflective surface. Reflection and refraction are the two main aspects of geometric optics.
01 October 2014, 06:40 PM ET
Good air in, bad air out.
01 October 2014, 06:38 PM ET
Broccoli, the green vegetable both reviled and revered by U.S. presidents, is a nutrient powerhouse.
30 September 2014, 07:24 PM ET
This endangered animal is the largest of the great apes.
30 September 2014, 07:19 PM ET
Pulling wisdom teeth easier before 30
30 September 2014, 07:05 PM ET
High in vitamin C and potassium, oranges may boost your immune system, improve your skin and reduce the risks of cancer.
29 September 2014, 08:54 PM ET
They may be tiny, but they can take down a venomous scorpion!
29 September 2014, 08:00 PM ET
Bananas are packed with nutrients and are good for your heart, your eyes, your diet and your mood.
28 September 2014, 09:29 PM ET
Properties, uses and sources of the element aluminum.
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.