15 December 2014, 09:19 PM ET
Global warming is the gradual heating of Earth's surface, oceans and atmosphere.
12 December 2014, 10:47 PM ET
12 December 2014, 12:47 AM ET
Rattlesnakes are found throughout North and South America. Their distinctive rattle warns intruders to stay away!
12 December 2014, 12:25 AM ET
Humans have invented six devices that combine to make work easier. These six simple machines are the wheel and axle, the lever, the inclined plane, the pulley, the screw and the wedge.
11 December 2014, 10:47 PM ET
Properties, sources and uses of the element silver.
11 December 2014, 10:24 PM ET
Funnel-web spiders build funnels out of their webs. Some of these spiders are among the most venomous in the world.
10 December 2014, 10:44 PM ET
Swollen veins that bump out from beneath the skin are called varicose veins or spider veins. There are several causes, as well as several methods of treatment.
10 December 2014, 10:35 PM ET
Bedbugs are stubborn parasites that leave itchy and unsightly bites, though they don't transmit disease or pose any serious medical risk.
10 December 2014, 09:49 PM ET
Legends about flying serpents are worldwide, but are dragon tales based in fact?
10 December 2014, 09:42 PM ET
The human brain is the command center for the human nervous system.
10 December 2014, 09:16 PM ET
Garter snakes are some of the most widespread snakes in North America. They can be found from Florida to Alaska.
09 December 2014, 10:34 PM ET
A sonogram, or ultrasound scan, can help determine the sex of a baby, but using fetal ultrasound to create keepsakes is not recommended.
09 December 2014, 10:30 PM ET
Thick plates protected this massive dinosaur from predators.
08 December 2014, 09:46 PM ET
Stegosaurus' distinctive features make it one of the most recognizable dinosaurs.
08 December 2014, 08:59 PM ET
Appendicitis is inflammation of the appendix. It is a serious illness and can be life threatening if not treated in time.
08 December 2014, 08:53 PM ET
Cervical cancer symptoms, diagnosis and treatment options.
05 December 2014, 09:52 PM ET
Bariatric surgery is an operation on the stomach and intestine used to treat obesity.
05 December 2014, 09:51 PM ET
Sleep apnea is a condition in which people experience pauses in breathing, or shallow breathing, during sleep.
05 December 2014, 09:41 PM ET
Diabetes is a metabolic disease marked by high blood glucose, also known as blood sugar.
05 December 2014, 08:48 PM ET
Magnetic resonance imaging (MRI) uses powerful magnets to realign a body's atoms, which creates a magnetic field that a scanner uses to create a detailed image of the body.
05 December 2014, 08:09 PM ET
Removing a tick correctly can lessen the chance of contracting a tick-borne illness.
04 December 2014, 06:15 PM ET
Type I diabetes is a disease where the pancreas stops producing insulin, a hormone that signals the body's cells to absorb glucose from the bloodstream and convert it into energy.
04 December 2014, 06:04 PM ET
Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle.
02 December 2014, 09:39 PM ET
El Niño is a climate cycle in the Pacific Ocean with a global impact on weather patterns.
02 December 2014, 08:30 PM ET
Here's how to engineer a mosquito-free environment, and what to do if these annoying insects do bite.
01 December 2014, 10:20 PM ET
Corn snakes are nonvenomous snakes found primarily in the southeastern United States. They are popular as pets, and selective breeding has produced many varieties, or morphs.
26 November 2014, 11:44 PM ET
They're the largest cat species that regularly climbs trees.
25 November 2014, 05:05 PM ET
The 650 muscles in the human body control movement and help to maintain posture, circulate blood and move substances throughout the body.
24 November 2014, 08:52 PM ET
Properties, sources and uses of the element sulfur.
24 November 2014, 08:36 PM ET
Their fur may be white, but their skin is black.
21 November 2014, 10:50 PM ET
The cottonmouth snake, also know as water moccasin, is North America's only poisonous water snake.
21 November 2014, 09:22 PM ET
They use those tusks to haul out on the ice!