References
17 April 2014, 03:36 AM ET
Pregnancy lasts about 40 weeks and is divided into three stages, or trimesters, each with unique symptoms and changes in the mother's body and in fetal development.
15 April 2014, 07:51 PM ET
The liver is a vital organ that supports nearly every other organ to some capacity. You cannot live without a healthy liver.
15 April 2014, 01:16 AM 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.
15 April 2014, 01:03 AM ET
Anthropology is the study of humans, early hominids and primates. Anthropologists study human language, culture and societies.
10 April 2014, 09:46 PM ET
The bicycle has a complicated past fraught with controversy and misinformation.
10 April 2014, 07:57 PM ET
For years, people have reported sudden showers of animals falling from the sky. What's really going on?
09 April 2014, 11:28 PM ET
A Cesarean section is a type of surgery used to deliver a baby through an incision in the mother's abdomen.
09 April 2014, 11:02 PM ET
The spleen is an important organ for keeping bodily fluids balanced. It is possible to live without it, but removal of the spleen has serious consequences.
07 April 2014, 06:35 PM ET
The Celts were an ancient people who spread across continental Europe, and only recently became associated with the British Isles.
07 April 2014, 05:10 PM ET
A miscarriage is the loss of pregnancy before the 20-week mark in the pregnancy. The medical term for a miscarriage is spontaneous abortion.
07 April 2014, 05:04 PM ET
The pancreas helps regulate blood sugar levels. It is also an important aid in digestion.
04 April 2014, 02:37 AM ET
NATO is an alliance of nations that have pledged to respond collectively to an attack against any other member.
04 April 2014, 02:26 AM ET
Suicide rates have been rising steadily, but awareness of the warning signs can help prevent suicide.
02 April 2014, 04:13 AM ET
Every labor story is different, but there are definitely signs that can let you know if you are in the early stages of labor.
02 April 2014, 02:55 AM ET
Biology is the science of life. Biologists study the structure, function, growth, origin, evolution and distribution of living organisms.
01 April 2014, 03:09 AM ET
The Romani ethnic group, often called Gypsies, have unique customs, spiritual beliefs and cultural traditions.
29 March 2014, 01:33 AM ET
Jane Goodall is a primatologist most known for her long-term study of wild chimpanzees in Tanzania.
28 March 2014, 02:51 AM ET
Archaeology is fundamentally the study of humanity and its past.
27 March 2014, 02:33 AM ET
Did you know that Easter eggs are wonderful materials for fun science projects? Try some of these eggs-periments and find out how interesting your eggs can be!
27 March 2014, 02:28 AM ET
When you think you may be pregnant, it's time to check with a pregnancy test. It's important to understand how they work, how to read the results and which one is the most accurate.
27 March 2014, 02:19 AM ET
Attila was king of the Huns, and a relentless warrior who attacked both the Western and Eastern Roman Empires.
26 March 2014, 02:34 AM ET
Italian culture, steeped in the arts, architecture, music and food, has flourished for centuries. Here is a brief overview of Italian customs and traditions.
26 March 2014, 02:27 AM ET
21 March 2014, 11:21 PM ET
Ever since King Tutankhamun's tomb was discovered, stories circulated that those who dared violate his final resting place faced a terrible curse. It was a useful ruse to scare off grave robbers.
21 March 2014, 08:29 PM ET
Sure, your clock is keeping time — but to what?
20 March 2014, 11:23 PM ET
Brightly colored materials in your kitchen can be used to make natural dyes for Easter eggs.
20 March 2014, 02:30 AM ET
There are several things a man can do to increase the chances that he will get a woman pregnant.
19 March 2014, 01:13 AM ET
The steam engine may seem like a relic of the past. But without this game-changing invention, the modern world would be a much different place.
18 March 2014, 12:37 AM ET
Russian culture has a long and rich history, steeped in literature, ballet, painting and classical music. Here is a brief overview of Russian customs & traditions.
15 March 2014, 01:39 AM ET
Sinkholes occur when the ground collapses gradually or suddenly due to dissolving bedrock, sometimes taking homes or cars with it.
15 March 2014, 01:12 AM ET
A urinary tract infection is an infection of any part of the urinary tract, which includes the bladder, kidneys, ureters and urethra.
13 March 2014, 01:16 AM ET
Garter snakes are some of the most widespread snakes in North America. They can be found from Florida to Alaska.