21 November 2015, 01:14 AM ET
A concussion is a traumatic brain injury (TBI) caused by the brain violently bouncing or twisting inside of the skull.
19 November 2015, 10:25 PM ET
"Natural" and "organic" are common on food labels, but the terms can be confusing. There are, however, specific definitions for each term.
18 November 2015, 06:50 PM ET
Diets that dramatically limit the grams of fat a person eats may be useful for short-term weight loss, but they may not be healthy in the long-term, experts say.
17 November 2015, 11:46 PM ET
The Mediterranean diet focuses on eating foods that are as natural as possible, while limiting unhealthy fats and red meat. Many studies have shown that this type of diet can be very beneficial.
13 November 2015, 07:21 PM ET
A calorie is a unit of energy. Counting calories is one way to monitor weight loss.
12 November 2015, 11:18 PM ET
Boa constrictors are non-venomous snakes famous for their method of subduing prey. They rank among the longest snakes in the world.
11 November 2015, 09:59 PM ET
A low-carb diet focuses on cutting carbohydrates from a person’s diet. While it can help some lose weight, it can also deprive the body of needed nutrients if taken to extremes.
11 November 2015, 09:35 PM ET
Water snakes are non-venomous snakes found in North America. They are sometimes misidentified as water moccasins, which are venomous.
11 November 2015, 10:39 AM ET
There are thousands of breeds of domestic sheep, and at least four species of wild sheep.
08 November 2015, 09:09 AM ET
Extract of the fruit garcinia cambogia is an ingredient in some nutritional supplements aimed at stopping weight gain. But is garcinia cambogia safe, and does it work? Here's a look at the evidence.
05 November 2015, 11:38 PM ET
Crows are large black birds that are known for their intelligence and adaptability.
02 November 2015, 10:50 PM ET
Alpacas are domesticated versions of a South American ruminant called the vicuña. There are no alpacas in the wild.
31 October 2015, 12:29 AM ET
The masked bandits of the animal kingdom they live in a wide range of climates and habitats.
30 October 2015, 10:56 PM ET
Anxious about antioxidants? Perplexed by polysaccharides? This guide will help you navigate the world of nutrition and health.
30 October 2015, 12:43 AM ET
Wombats are small marsupials that look like a cross between a bear, a pig and a gopher.
29 October 2015, 02:11 AM ET
Simple harmonic motion describes the vibration of atoms, the variability of giant stars, and countless other systems from musical instruments to swaying skyscrapers.
29 October 2015, 02:04 AM ET
Salamanders are amphibians that look like a cross between a frog and a lizard. Species include newts, mudpuppies and hellbenders.
27 October 2015, 12:25 AM ET
The dingo is a wild, medium-size canine that has roamed Australia for thousands of years.
23 October 2015, 12:29 AM ET
The mongoose is a long, furry creature with a legendary reputation as a ferocious snake fighter.
22 October 2015, 12:17 AM ET
Impalas are medium-sized antelopes that are native to Africa. They are great jumpers that use their speed to escape predators.
21 October 2015, 01:20 AM ET
Phytonutrients are chemicals produced by plants. Plants use them to stay healthy, and people who eat phytonutrient-rich foods get health benefits as well.
21 October 2015, 01:12 AM ET
Goats are among the earliest domesticated animals. Mountain goats live in steep, rocky areas.
20 October 2015, 05:00 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.
20 October 2015, 12:52 AM ET
Flavonoids are compounds found in almost all fruits and vegetables. They are associated with many health benefits.
17 October 2015, 10:56 AM ET
Mitosis is a method of cell division in which a cell divides and produces identical copies of itself.
15 October 2015, 01:20 AM ET
Meiosis is a specialized form of cell division that produces reproductive cells, such as plant and fungal spores, sperm and egg cells.
15 October 2015, 01:12 AM ET
These two closely related forces describe circular motion, but the meanings are often mixed up.
15 October 2015, 01:01 AM ET
Carotenoids are plant pigments responsible for bright red, yellow and orange hues. People who eat foods containing carotenoids get protective health benefits.
13 October 2015, 02:30 AM ET
The phrase "busy as a beaver" aptly describes these big-toothed rodents that can change the landscape and their environment.
09 October 2015, 11:32 AM ET
Here's a look at all Nobel Peace Prize recipients, including Barack Obama, Mother Teresa, Nelson Mandela and Martin Luther King Jr.
08 October 2015, 08:00 AM ET
The winners of the Nobel Prize in Literature, including Toni Morrison, Gabriel Garcia Marquez and John Steinbeck.
07 October 2015, 07:53 PM ET
Badgers are small mammals that are ferocious hunters and members of the largest family of carnivores.