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.
07 October 2015, 07:08 AM ET
A list of the winners of the Nobel Prize in Chemistry, including Marie Curie, Roger Kornberg and Otto Hahn.
06 October 2015, 09:03 AM ET
Here's a look at all winners of the Nobel Prize in physics, including Steven Chu, Aage Niels Bohr and Enrico Fermi.
06 October 2015, 12:36 AM ET
Armadillos are small mammals with a shell of armored plates that protect them from predators.
05 October 2015, 07:31 AM ET
Here's a look at past winners of the Nobel Prize in Medicine.
01 October 2015, 11:56 PM ET
The tongue is a mighty flexible organ. It enables licking, breathing, tasting, swallowing and speaking.
01 October 2015, 11:44 PM ET
Turtles, tortoises and terrapins are reptiles with protective shells. They live on land, in the ocean and in lakes and rivers. There are more than 300 species.