21 April 2015, 05:03 PM ET
Earth Day is an annual event, observed on April 22, that celebrates the planet's environment and raises public awareness about pollution.
20 April 2015, 11:52 PM ET
Abdominal pain, bloating and gas all symptoms of IBS
20 April 2015, 11:02 PM ET
Earthquakes occur every day, but most people don't notice the small ones. Here's what causes earthquakes.
13 April 2015, 07:38 PM ET
Dogs are part of a large taxonomic family called Canidae, which also includes wolves, coyotes, foxes and jackals. Members are called canids. Domestic dogs are a subspecies called Canis lupus familiaris.
11 April 2015, 12:50 AM ET
Brown rice is a highly nutritious grain. It is good for the heart, aids digestion and may reduce the risk of cancer, diabetes and high cholesterol.
10 April 2015, 09:42 PM ET
Acid reflux disease, also called gastroesophageal reflux disease (GERD), is a chronic condition that occurs when stomach contents wash up into the throat.
09 April 2015, 06:13 PM ET
Hemp is a non-drug variety of the Cannabis plant with many uses.
07 April 2015, 11:35 PM ET
THC is the main mind-altering ingredient found in the Cannabis plant.
07 April 2015, 11:26 PM ET
Lung cancer is the deadliest type of cancer, causing more than 150,000 deaths annually in the United States. Smoking is the No. 1 cause of lung cancer.
07 April 2015, 07:14 PM ET
Quadratic equations are basic to algebra and are the math behind parabolas, projectiles, satellite dishes and the golden ratio.
06 April 2015, 10:13 PM ET
Quinoa, a plant from the Andes, is packed with protein, fiber and various vitamins and minerals.
06 April 2015, 09:41 PM ET
Radio waves are a type of electromagnetic radiation. The best-known use of radio waves is for communication.
06 April 2015, 07:44 PM ET
Prostate cancer is one of the most common forms of cancer in men: Almost 240,000 men in the United States are diagnosed with prostate cancer each year.
02 April 2015, 11:45 PM ET
Malignant mesothelioma is a cancer of the thin layer of tissue that covers the heart, lungs and other internal organs.
31 March 2015, 07:17 PM ET
Ultraviolet light is a type of electromagnetic radiation. These high-frequency waves can damage living tissue.
31 March 2015, 04:24 PM ET
Pregnancy lasts about 40 weeks and is divided into three stages, or trimesters, each with unique symptoms and changes in the mother's body and in fetal development.
30 March 2015, 07:49 PM ET
Science is a systematic and logical approach to discovering how things in the universe work.
26 March 2015, 12:25 PM ET
The human brain is the command center for the human nervous system.
26 March 2015, 02:52 AM ET
Infrared radiation is a type of electromagnetic radiation. It is invisible to human eyes, but people can feel it as heat.
26 March 2015, 02:43 AM ET
Microwaves are a type of electromagnetic radiation, and are useful in communications, radar and cooking.
26 March 2015, 02:32 AM ET
Algebra is a branch of mathematics dealing with symbols and the rules for manipulating those symbols.
25 March 2015, 11:56 PM ET
In science, a law describes an observed phenomenon.
24 March 2015, 08:28 PM ET
Empirical evidence is information that is acquired by observation or experimentation.
23 March 2015, 10:23 PM ET
Deduction starts out with a generalization that follows a process to reach a specific, logical conclusion. Induction is the opposite - making a generalization from a set of specific observations.
23 March 2015, 10:21 PM ET
Giganotosaurus was one of the largest meat-eating dinosaurs.
20 March 2015, 11:35 PM ET
Gamma-rays are a form of electromagnetic radiation. They can be used to treat cancer, and gamma-ray bursts are studied by astronomers.
20 March 2015, 08:50 PM ET
A woman can deliver her baby either by vaginal birth or a C-section. Both delivery methods have advantages and disadvantages.
19 March 2015, 10:51 PM ET
A Cesarean section is a type of surgery used to deliver a baby through an incision in the mother's abdomen.
19 March 2015, 10:41 PM ET
Diplodocus was a long-necked, long-tailed dinosaur that roamed western North America.
17 March 2015, 10:14 PM ET
A scientific theory is based on careful examination of facts. It is much different from the non-scientific use of the word.
17 March 2015, 10:03 PM ET
A hypothesis is the first step in the scientific method. It begins by asking, 'What if …?'
16 March 2015, 09:56 PM ET
Every year, tens of thousands of Americans die from suicide. It is the third leading cause of death among young people between the ages of 10 and 24, amounting to about 4,600 deaths a year.