12 March 2015, 10:11 PM ET
Electromagnetic radiation is a form of energy that includes radio waves, microwaves, X-rays and gamma rays, as well as visible light.
12 March 2015, 10:03 PM ET
Amazing views from 1947 to 2012, including several firsts.
10 March 2015, 10:24 PM ET
Heroin is an opiate drug and a high potential for abuse.
10 March 2015, 10:16 PM ET
The San Andreas Fault in California is a strike-slip fault that marks the boundary between two of Earth's tectonic plates.
10 March 2015, 10:05 PM ET
The different ways that the environment gets contaminated.
09 March 2015, 10:07 PM ET
Chronic kidney disease (CKD) is the gradual and permanent loss of kidney function over time, usually over months to years.
09 March 2015, 10:02 PM ET
Qigong is an exercise and healing technique developed in China more than 4,000 years ago.
06 March 2015, 04:48 PM ET
HDL is “good” cholesterol; LDL is “bad” cholesterol. HDL helps lower LDL. Too much LDL can lead to heart disease and heart attacks.
05 March 2015, 11:54 PM ET
Treatment with acupuncture needles does work to alleviate pain and nausea, studies show.
05 March 2015, 11:31 PM ET
Gallstones are small deposits of bile inside the gallbladder, a saclike structure that stores the bile for digestion in the small intestine.
05 March 2015, 11:05 PM ET
Each year, rip currents kill more people than sharks or jellyfish or even hurricanes.
04 March 2015, 11:41 PM ET
CRE are a type of bacteria that have become resistant to most antibiotics. Infections usually occur in health care settings.
04 March 2015, 10:02 PM ET
Deforestation, the permanent destruction of forests in order to make the land available for other uses, is considered to be a contributing factor to global climate change.
04 March 2015, 08:54 PM ET
Endometriosis is a medical condition that occurs when the lining of the uterus, called the endometrium, grows in other places.
03 March 2015, 09:49 PM ET
Tessellation is a repeating pattern of the same shapes without any gaps or overlaps. These patterns are found in nature, used by artists and architects and studied for their mathematical properties.
03 March 2015, 06:23 PM ET
The dinosaur with the fearsome face was a gentle giant.
20 February 2015, 06:48 PM ET
Properties, sources and uses of the element argon.
20 February 2015, 06:35 PM ET
Inflammatory bowel disease (IBD) is a condition that involves chronic inflammation in all or part of the digestive tract.
20 February 2015, 06:24 PM ET
19 February 2015, 09:43 PM ET
Properties and uses of the element sodium.
19 February 2015, 09:41 PM ET
The liver is a vital organ that supports nearly every other organ to some capacity. You cannot live without a healthy liver.
19 February 2015, 08:29 PM ET
Culture is the characteristics of a particular group of people, defined by everything from language, religion, cuisine, social habits, music and arts
18 February 2015, 10:39 PM ET
Gestational diabetes is a type of diabetes that develops, or is first diagnosed, during pregnancy. The condition, like other forms of diabetes, involves high blood sugar levels.
18 February 2015, 10:32 PM ET
Itchy eyes, a congested nose, sneezing, wheezing and hives: these are symptoms of an allergic reaction to the environment caused when plants release pollen into the air, usually in the spring or fall.
18 February 2015, 10:27 PM ET
Reiki is a therapy often described as palm healing or hands-on-body healing in which a practitioner places hands lightly on or over a patient's body to treat or cure various ailments.
13 February 2015, 10:46 PM ET
Liver cancer is cancer that begins in the tissues of the liver, though it may also result from cancer spreading to the liver from other parts of the body.
13 February 2015, 09:58 PM ET
Hair loss is typically considered the domain of aging men, but this equal-opportunity condition — which has many causes — can affect virtually anyone.
11 February 2015, 09:09 PM ET
When a pregnancy ends unexpectedly through a miscarriage, a woman may recover physically long before she heals from it emotionally.
11 February 2015, 08:03 PM ET
Hepatitis is the inflammation of the liver, which is most often caused by a viral infection.
11 February 2015, 07:52 PM ET
Crohn’s disease is a chronic inflammatory bowel disease (IBD) that involves inflammation in all or part of the digestive tract.
11 February 2015, 07:45 PM ET
Studies have shown that devices such as magnetic bracelets have no more benefit than devices without magnets, in essence demonstrating the placebo effect magnets have on their users.
11 February 2015, 07:39 PM ET
Peak oil refers to the point in time when global oil production peaks and begins to drop.