18 December 2014, 06:06 PM ET
Properties, sources and uses of the element mercury.
17 December 2014, 11:15 PM ET
The consequences of global warming are expected to be far-reaching, long-lasting and, in many cases, devastating.
17 December 2014, 11:10 PM ET
Strep throat is a bacterial infection. It is very contagious and can lead to severe complications.
17 December 2014, 10:39 PM ET
About 300 million years ago, all the seven continents formed one massive supercontinent called Pangaea.
16 December 2014, 09:46 PM ET
Laryngitis is inflammation of the larynx (voice box). The swelling causes hoarseness and limits your ability to talk.
16 December 2014, 09:29 PM ET
Camel spiders are not spiders, and they don't eat camels — or people. These arachnids became infamous after the Gulf War.
16 December 2014, 09:12 PM ET
Properties, sources and uses of the element magnesium.
16 December 2014, 12:46 AM ET
Coral snakes are small, vibrantly colored, highly poisonous snakes found in Asia and in the Americas. When threatened, they make a popping sound with their cloacas — essentially a fart.
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, 09:16 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.