12 February 2014, 07:48 PM ET
The Precambrian was the first super eon of Earth’s history, lasting from about 4.6 billion to 542 million years ago.
12 February 2014, 07:42 PM ET
Implicit memory uses past experiences to remember things without thinking about them, like how to ride a bike or button a shirt.
11 February 2014, 05:16 PM ET
STEM is a curriculum based on the idea of educating students in four specific disciplines — science, technology, engineering and mathematics — in an interdisciplinary and applied approach.
11 February 2014, 05:08 PM ET
The Triassic Period occurred between 251 million and 199 million years ago. It was a time when life outside of the oceans began to diversify.
10 February 2014, 07:05 PM ET
Genghis Khan and his successors conquered vast territories, from China to eastern Europe.
07 February 2014, 07:27 PM ET
A subduction zone is a collision between two of Earth's tectonic plates, where one plate sinks into the mantle underneath the other plate.
07 February 2014, 07:16 PM ET
The Permian Period lasted from 299 million to 251 million years ago. Two groups of animals that dominated the period would later branch into mammals and reptiles.
07 February 2014, 06:59 PM ET
Spinal stenosis is a narrowing of the spinal canal, the opening created by the small hole found in each of the vertebrae that make up the human spinal column.
05 February 2014, 11:21 PM ET
Declarative memory, or explicit memory, consists of facts and events that can be explicitly stored and consciously recalled or "declared."
05 February 2014, 11:02 PM ET
The Quaternary Period is a geologic time period that encompasses the most recent 2.6 million years — including the present day.
04 February 2014, 05:07 PM ET
Carl Jung's concept of synchronicity can be boiled down to describing "meaningful coincidences."
31 January 2014, 11:44 PM ET
The Ishtar Gate was one of eight gateways that provided entry to the inner city of Babylon.
31 January 2014, 12:37 AM ET
Louis Pasteur was a French chemist who proved that germs cause disease, developed vaccines for anthrax and rabies and created the process of pasteurization.
31 January 2014, 12:32 AM ET
Appendicitis is inflammation of the appendix. It is a serious illness and can be life threatening if not treated in time.
30 January 2014, 09:28 AM ET
Magnesium supplements are touted as helping people with many different health conditions, however, does the science support these claims?
30 January 2014, 12:44 AM ET
Complex numbers are numbers that consist of two parts — a real number and an imaginary number.
30 January 2014, 12:34 AM ET
The gallbladder is a small organ that is used to store bile, which breaks up the fat in food.
30 January 2014, 12:29 AM ET
Atrial fibrillation is a heart condition caused by irregularities in the cardiac electrical signal. The condition can result in stroke or heart failure, but treatment is available.
29 January 2014, 01:38 AM ET
Occupational therapists help patients conduct the activities of daily life that give them meaning.
29 January 2014, 01:32 AM ET
Diclofenac is often used to treat pain, tenderness, swelling and stillness resulting from various types of arthritis.
29 January 2014, 12:02 AM ET
Semantic memory is the recollection of nuggets of information we have gathered from the time we are young.
28 January 2014, 01:42 AM ET
Short-term memory loss occurs when a person can remember incidents from 20 years ago but is fuzzy on the details of things that happened 20 minutes prior. Medical conditions and injuries can cause short-term memory loss.
28 January 2014, 01:37 AM ET
Zofran: Dosage, Side Effects & Pregnancy
23 January 2014, 11:15 PM ET
People who have stigmata exhibit wounds that duplicate or represent those that Jesus is said to have endured during his crucifixion. Whether they appear spontaneously or are self-inflicted is difficult to verify.
23 January 2014, 11:07 PM ET
The Tower of London is a 900-year-old castle and fortress in central London that is notable for housing the crown jewels and for holding many famous and infamous prisoners.
23 January 2014, 12:14 AM ET
Portuguese explorer Ferdinand Magellan led the first voyage around the world.
22 January 2014, 11:10 PM ET
Acetaminophen is an over-the-counter pain reliever works by elevating the pain threshold so that only more intense pain is felt.
22 January 2014, 08:51 PM ET
A kidney stone is a hard mass that forms in the kidneys from minerals in the urine, and if large enough, can cause serve pain.
22 January 2014, 12:21 AM ET
Wood stoves, which have been around for hundreds of years, have been updated for the 21st century.
22 January 2014, 12:04 AM ET
An imaginary number is a number that, when squared, has a negative result.
17 January 2014, 01:47 AM ET
Martin Luther King Jr. was a civil rights leader who fought for racial and economic justice. His oft-quoted "I Have a Dream" speech made an incredible impact on the country’s racial, cultural and intellectual landscape.
15 January 2014, 10:54 PM ET
A real number is a value that represents a quantity along an infinite number line. They are, in fact, pretty much any number that you can think of.