References
23 January 2015, 05:43 PM ET
The history, properties, sources, uses and isotopes of the element hydrogen.
23 January 2015, 05:31 PM ET
Avoid cigarettes, aspirin and alcohol to help ulcers heal
23 January 2015, 05:19 PM ET
Germans place a high value on hard work, precision and order, and have made tremendous contributions to engineering, classical music and beer. Here is an overview of German customs, traditions and values.
21 January 2015, 08:04 PM ET
Erectile dysfunction (ED) is the inability to get or keep an erection. It is caused when penile tissues do not fill up with blood.
21 January 2015, 07:56 PM ET
Every labor story is different, but there are definitely signs that can let you know if you are in the early stages of labor.
21 January 2015, 07:38 PM ET
The customs and traditions of France, center of fashion, art and architecture.
20 January 2015, 10:36 PM ET
Properties, sources and uses of the element zinc.
20 January 2015, 10:31 PM ET
Crystal healing is an alternative medicine technique that employs crystals and other stones as conduits for natural healing energy.
20 January 2015, 10:03 PM ET
Chinese culture reflects the customs and traditions of one of the largest countries in the world, with 1.34 billion people.
15 January 2015, 10:50 PM ET
Nearly 6 million U.S. adults suffer from bipolar disorder.
15 January 2015, 10:23 PM ET
Nearly every region of the world has influenced the customs and traditions of the United States.
15 January 2015, 10:19 PM ET
The urinary system – also known as the renal system – produces, stores and eliminates urine, the fluid waste excreted by the kidneys
15 January 2015, 09:29 PM ET
Atrial fibrillation is a heart condition caused by irregularities in the cardiac electrical signal. The condition can result in stroke or heart failure, but treatment is available.
15 January 2015, 09:27 PM ET
The symptoms of hantavirus infection plus causes, treatments and other facts.
14 January 2015, 10:26 PM ET
What's behind perpetually lousy moods.
14 January 2015, 10:26 PM ET
Medical marijuana is legal in some states, but debate rages on about whether the health benefits outweigh the risks.
14 January 2015, 10:19 PM ET
Heart disease, or cardiovascular disease, encompasses a range of conditions. The root of heart disease is when that blood flow is blocked.
14 January 2015, 10:06 PM ET
Beryllium is one of the lightest metals and has one of the highest melting points among the light metals.
14 January 2015, 10:04 PM ET
Aquifers are underground layers of rock that are saturated with water that can be brought to the surface through natural springs or by pumping.
13 January 2015, 11:49 PM ET
Cannabis, or marijuana, is one of the oldest psychoactive substances. It is often smoked, brewed or eaten for its medicinal and recreational effects.
13 January 2015, 11:44 PM ET
Lake Vostok is one of the largest subglacial lakes in the world. It may harbor unique types of organisms.
13 January 2015, 08:13 PM ET
Frostbite is the freezing of the skin and tissue caused by excessive exposure to freezing temperatures.
13 January 2015, 06:22 PM ET
Insomnia is a sleep disorder characterized by difficulties falling or staying asleep, even though people have the chance for adequate sleep.
13 January 2015, 06:00 PM ET
Schizophrenia is a chronic, debilitating mental disorder characterized by distortions of thinking and perception.
12 January 2015, 11:46 PM ET
Seasonal affective disorder (also called SAD) is a type of depression that is often triggered by reduced daylight during winter months.
12 January 2015, 11:42 PM ET
Bulimia nervosa is an eating disorder in which people regularly binge (or overeat) and then engage in unhealthy behaviors to prevent putting on weight.
12 January 2015, 11:04 PM ET
Melanoma is a type of skin cancer that begins in the skin's pigment-producing cells, called melanocytes. These cells make melanin, which is responsible for the color in skin, eyes and hair.
08 January 2015, 08:37 PM ET
Groundwater is any freshwater that lies beneath the surface of the Earth.
07 January 2015, 10:33 PM ET
Numerous fossils make this one of the most-studied dinosaurs.
07 January 2015, 10:26 PM ET
The Mesozoic Era saw the rise of some of the most iconic animals, from Tyrannosaurus rex to birds and mammals.
07 January 2015, 10:13 PM ET
These long-lived, large windstorms are difficult to predict.
07 January 2015, 10:02 PM ET
The human heart is an organ that pumps blood throughout the body via the circulatory system.