References
13 October 2014, 08:13 PM ET
Whooping cough, also known as pertussis, is a bacterial infection of the respiratory tract that causes severe coughing. The disease is especially serious for babies.
13 October 2014, 06:10 PM ET
Winners of the Nobel Prize in economics, including Paul Krugman, Daniel Kahneman and Milton Friedman.
13 October 2014, 02:47 PM ET
Use this body mass index (BMI) calculator to estimate your body fat and to see if you’re considered underweight, normal, overweight or obese.
13 October 2014, 02:35 PM ET
A spinal cord injury is caused by damage to parts of the spine.
11 October 2014, 05:38 PM ET
Bladder cancer is a cancer of the lining of the bladder.
10 October 2014, 10:28 PM ET
Industrial engineering is the branch of engineering that involves figuring out how to make or do things better.
10 October 2014, 09:11 AM ET
Here's a look at all Nobel Peace Prize recipients, including Barack Obama, Mother Teresa, Nelson Mandela and Martin Luther King Jr.
09 October 2014, 09:53 PM ET
The job of the immune system is to protect against disease.
09 October 2014, 09:28 PM ET
An ultrasound scan is used to get an image from within the human body. It is most widely known for its use during pregnancy.
09 October 2014, 09:24 PM ET
These ancient Egyptian monuments are still a source of speculation and debate.
09 October 2014, 09:13 PM ET
Potatoes are often thought of as a comfort food — richly mashed or crisply fried — but when prepared the right ways, these vegetables are actually quite nutritious.
09 October 2014, 08:43 AM ET
The winners of the Nobel Prize in Literature, including Toni Morrison, Gabriel Garcia Marquez and John Steinbeck.
08 October 2014, 09:40 PM ET
The Mariana Trench reaches more than 7 miles below the surface of the Pacific Ocean.
08 October 2014, 09:05 PM ET
A woman's body goes through a number of changes in the earliest stages of pregnancy. Here are 10 clues to help a woman figure out whether she's pregnant.
08 October 2014, 09:01 PM ET
Angkor Wat in Cambodia is one of the largest religious monuments ever constructed.
08 October 2014, 07:05 AM ET
A list of the winners of the Nobel Prize in Chemistry, including Marie Curie, Roger Kornberg and Otto Hahn.
07 October 2014, 08:17 PM ET
Watermelons may be mostly water but these refreshing fruits are soaked with nutrients.
07 October 2014, 07:10 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 2014, 04:42 PM ET
Properties, sources and uses of the element copper.
06 October 2014, 01:15 PM ET
Chlamydia is a bacterial infection that can be spread through sexual contact with an infected person.
06 October 2014, 10:15 AM ET
Here's a look at past winners of the Nobel Prize in Medicine.
03 October 2014, 09:59 PM ET
Stonehenge, a huge prehistoric monument, was built 5,000 years ago in England. Its builders and its purpose remain a mystery.
03 October 2014, 09:22 PM ET
Creutzfeldt-Jakob Disease (CJD) is a rare, yet fatal, brain disease characterized by the spongy degeneration of the brain.
03 October 2014, 08:18 PM ET
There are nine subspecies of this largest member of the cat family, all of which are endangered.
03 October 2014, 12:52 AM ET
Chemical engineering is the branch of engineering that deals with chemical production and the manufacture of products through chemical processes.
02 October 2014, 09:20 PM ET
Lions have a fierce roar and roam in prides, you can see pictures and learn more facts here.
01 October 2014, 10:43 PM ET
A mirror image is the result of light rays bounding off a reflective surface. Reflection and refraction are the two main aspects of geometric optics.
01 October 2014, 06:40 PM ET
Good air in, bad air out.
01 October 2014, 06:38 PM ET
Broccoli, the green vegetable both reviled and revered by U.S. presidents, is a nutrient powerhouse.
30 September 2014, 07:24 PM ET
This endangered animal is the largest of the great apes.
30 September 2014, 07:19 PM ET
Pulling wisdom teeth easier before 30
30 September 2014, 07:05 PM ET
High in vitamin C and potassium, oranges may boost your immune system, improve your skin and reduce the risks of cancer.