References
31 May 2014, 03:23 AM ET
In many ways, the history of civilization is the history of chemistry. Humans have always sought to identify, use and change the materials in our environment.
31 May 2014, 02:25 AM ET
About 40 million Americans suffer from seasonal allergies. The most common culprit is pollen.
30 May 2014, 01:18 AM ET
Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with energy.
29 May 2014, 11:12 AM ET
Manhattanhenge, a phenomenon when the setting sun is perfectly aligned with Manhattan's grid-patterned streets, occurs twice a year with a full sunset, and twice a year with a half sunset.
29 May 2014, 03:03 AM ET
Nikola Tesla is often called one of history’s most important inventors, one whose discoveries in the field of electricity were way ahead of his time.
29 May 2014, 02:48 AM ET
The Goths sacked Rome in A.D. 410, but they also helped preserve Roman culture.
28 May 2014, 02:56 PM ET
There are more than 260 known species of monkeys in the world.
23 May 2014, 10:27 AM ET
Foxes are found all over the world. In folklore, foxes are typically characterized as cunning creatures sometimes having magical powers.
21 May 2014, 03:31 PM ET
Sloths spend most of their time sleeping and eating in the tropical rainforests of South and Central America.
21 May 2014, 11:14 AM ET
Great masses of flesh that wash up on shore have mystified people for centuries. Tests show that they aren't actually sea monsters.
21 May 2014, 12:38 AM ET
The Gregorian calendar — used by most of the world — was introduced to fix errors in the Julian calendar mostly having to do with leap years.
20 May 2014, 12:42 AM ET
Druids were revered in ancient Britain. Much about them is a mystery, but we know this: They did not build Stonehenge.
16 May 2014, 10:35 PM ET
A woman can deliver her baby either by vaginal birth or a C-section. Both delivery methods have advantages and disadvantages.
15 May 2014, 09:18 PM ET
Our modern Western calendar is almost entirely a Roman invention, but it has changed significantly throughout history.
12 May 2014, 08:27 PM ET
A midwife is a trained professional who aids and supports women in their pregnancies. Many women with low-risk pregnancies prefer using a midwife.
09 May 2014, 07:54 PM ET
The use of "anno domini" and "before Christ" to mark time began in the early days of Christianity, when clerics needed to know when Easter would fall.
09 May 2014, 07:27 PM ET
The first atomic bombs were detonated during World War II.
07 May 2014, 07:23 PM ET
The Romans named the days of the week after their gods. The Germanic people adapted the Roman system and gave us the English names of the days.
07 May 2014, 01:19 AM ET
Prostate cancer is one of the most common forms of cancer in men: Almost 240,000 men in the United States are diagnosed with prostate cancer each year.
07 May 2014, 01:14 AM ET
Claims that some twins share a telepathic bond are anecdotal at best.
03 May 2014, 01:30 AM ET
Seasonal allergies can be treated with OTC medicines, prescription drugs and natural remedies. Learn which medications address which symptoms.
02 May 2014, 08:37 AM ET
As the search for Malaysia Airlines Flight 370 continues, here are some facts about the passengers, crew, aircraft and airline.
01 May 2014, 11:27 PM ET
To the ancient Greeks, a barbarian was someone who didn't speak Greek. Over time, the word has taken on new meanings.
01 May 2014, 10:44 PM ET
The Egyptians started dividing the day into 24 units, a practice that continues to influence how we tell time.
01 May 2014, 09:23 PM ET
The San Andreas Fault triggered some of the biggest earthquakes in United States history.
01 May 2014, 01:16 AM ET
The desire and need to cool the air goes back millennia. Air conditioning began in ancient Egypt and was perfected in the 20th century.
30 April 2014, 04:04 PM ET
A convergent series is a mathematical series in which the sequence of partial sums converges to a finite number. A divergent series is just the opposite — the sums do not meet a finite limit.
30 April 2014, 02:29 AM ET
The Hope Diamond is one of the most spectacular gems in the world, but some people believe ownership comes at a cost.
25 April 2014, 05:41 PM ET
The Holocaust refers to the Nazi-sponsored murder of the Jewish population of Europe — and other groups — during World War II. The International Holocaust Remembrance Day is April 28.
24 April 2014, 05:35 PM ET
Whey protein is a supplement often used for building muscle. But is it safe to use, and does it work? Live Science looked at the science behind taking whey protein.
19 April 2014, 01:18 AM ET
Dividing the day into hours, minutes and seconds is a recent practice with thousands of years of science and tradition behind it.
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.