22 May 2015, 01:22 AM ET
The Second Law of Thermodynamics says, in simple terms, entropy always increases. This principle explains, for example, why you can't unscramble an egg.
22 May 2015, 01:00 AM ET
A logarithm determines how many times a certain number must be multiplied by itself to reach another number.
20 May 2015, 01:35 AM ET
Oil pulling is the practice of swishing or holding oils from plants in the mouth for long periods of time to produce health benefits.
19 May 2015, 02:17 AM ET
The First Law of Thermodynamics states that energy cannot be created or destroyed, but it can be transferred from one location to another and converted to and from other forms of energy.
19 May 2015, 02:02 AM ET
Egg whites are a healthy alternative to whole eggs for people concerned about cholesterol. They provide protein, potassium and other essential minerals.
19 May 2015, 01:34 AM ET
A woman's body undergoes many transformations during the nine months of pregnancy. Many are well known, but some bodily changes may be unexpected and catch some women by surprise.
19 May 2015, 01:26 AM ET
Sleep paralysis is the inability to move or speak immediately after waking up. It happens when a person wakes up before REM sleep is finished.
14 May 2015, 09:01 PM ET
Tonsil stones are accumulations of bacteria and debris in the crypts of some people's tonsils. This problem is not dangerous and is usually easily treatable.
14 May 2015, 01:45 AM ET
Eggs have come under a lot of scrutiny in recent years, and scientists are questioning whether the cholesterol in eggs is as bad for you as previously thought.
14 May 2015, 01:14 AM ET
The Zeroth Law of Thermodynamics states that if two bodies are each in thermal equilibrium with some third body, then they are also in equilibrium with each other.
13 May 2015, 10:58 PM ET
Charles Darwin's theory of evolution and natural selection isn't an idea with holes. It's one of the most solid theories in science. But what exactly is it?
13 May 2015, 08:51 PM ET
Albuterol is a prescription medicine prescribed for patients struggling with asthma, emphysema, bronchitis and other lung diseases.
13 May 2015, 01:44 AM ET
Kale is a leafy green that is highly nutritious, containing high levels of vitamins, minerals, and brain-boosting phytonutrients.
11 May 2015, 09:15 PM ET
Superfoods are foods thought to be good for one's health. The term has no set scientific meaning, however, and any list of superfoods is subjective.
08 May 2015, 01:58 AM ET
Calculus is a branch of mathematics that explores variables and how they change by looking at them in infinitely small pieces.
07 May 2015, 08:33 PM ET
Thermodynamics is the branch of physics that deals with the relationships between heat and other forms of energy.
07 May 2015, 04:57 PM ET
Augmentin is a broad-spectrum antibiotic that works against many common infections, including strep throat, ear infections and pneumonia.
07 May 2015, 04:52 PM ET
Facts and information about the March 11, 2011, earthquake and tsunami that struck Japan.
06 May 2015, 09:43 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.
06 May 2015, 01:52 AM ET
Drug allergies are caused when the immune system responds to some chemical portion of a medicine, and symptoms can range from mild to deadly.
05 May 2015, 10:51 PM ET
Diarrhea is one of the most commonly reported ailments in the United States. It can be caused by parasites, viruses or bacteria.
05 May 2015, 01:17 AM ET
Nepal is a narrow, landlocked country directly north of India and below China. Located where two tectonic plates meet, it the area is prone to earthquakes.
02 May 2015, 03:16 AM ET
Horses are ungulates — mammals with hooves. There are more than 400 different breeds.
02 May 2015, 03:05 AM ET
The physical discomforts of pregnancy as well as the emotional stress of this major life change can cause sleep problems and keep a mother-to-be awake at night.
01 May 2015, 01:21 AM ET
Frogs are amphibians known for their jumping abilities, croaking sounds, bulging eyes and slimy skin. They live all over the world and are among the most diverse animals in the world.
30 April 2015, 10:57 PM ET
Water fluoridation is the addition of the chemical fluoride to public water supplies, for the purpose of reducing cavities. The process has caused controversy for more than 60 years.
30 April 2015, 10:44 PM ET
This may be the most important system in the body. Without the ability to reproduce, a species dies.
30 April 2015, 01:27 AM ET
Mitochondria are specialized cellular structures that power various functions.
30 April 2015, 01:21 AM ET
Visible light is the portion of the electromagnetic spectrum that we can see. We perceive the energy as colors.
28 April 2015, 11:11 PM ET
Guinea pigs are a domesticated species of rodent that are popular as pets — and food. These animals no longer exist in the wild.
28 April 2015, 10:23 PM ET
Batteries power everything from your smartphone to your car, but do you know how they work?
28 April 2015, 07:33 PM ET
Archaeopteryx was an evolutionary link between dinosaurs and birds.