22 June 2015, 09:55 PM ET
Homo erectus was an ancient human ancestor that lived roughly between 2 million and 100,000 years ago.
19 June 2015, 10:00 PM ET
Temperatures rise and the livin' is easy.
18 June 2015, 01:24 AM ET
Health professionals consider breast-feeding to be the best choice for baby. However, for some mothers bottle-feeding may be the better option.
17 June 2015, 04:10 AM ET
Pascal's triangle, a simple yet complex mathematical construct, hides some surprising properties related to number theory and probability.
16 June 2015, 03:36 AM ET
Hedgehogs are small mammals with cone-shaped faces, short legs and bodies that are covered with porcupine-like quills, but they are not closely related to porcupines.
11 June 2015, 09:20 PM ET
Iguanas are lizards identified by their stocky stature, saggy skin and spines. They are popular pets and can live 15 to 20 years if cared for properly.
10 June 2015, 03:07 AM ET
There are 47 species of deer, including caribou, elk, moose and wapiti.
09 June 2015, 03:02 AM ET
Chipmunks are rodents that are a type of squirrel. They are identified by their stubby legs, bushy tails and the white, black and brown stripes that run down their backs.
04 June 2015, 09:21 PM ET
In geometry, an object exhibits symmetry if it looks the same after a transformation, such as reflection or rotation. Symmetry is important in art, math, biology and chemistry.
04 June 2015, 06:13 PM ET
Oxytocin is a hormone that plays a large role in social interactions and social bonding.
03 June 2015, 12:15 AM ET
Chameleons are lizards that are known as one of the few animals that can change skin color.
02 June 2015, 09:42 PM ET
Cold sores are generally caused by Herpes Simplex Virus Type 1, which can hibernate in nerve cells and reappear when you're sick or stressed.
02 June 2015, 01:35 AM ET
A woman's emotional well-being and her mental outlook can also play important roles in pregnancy.
02 June 2015, 12:04 AM ET
High blood pressure is a serious disease that can, over time, damage the blood vessel walls and increase a person's risk of heart attack, stroke and other conditions.
30 May 2015, 04:58 AM ET
Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles.
29 May 2015, 11:25 AM ET
Apes, which include gorillas, bonobos, chimpanzees, orangutans, gibbons, siamangs — and people — are humanity's closest living relatives. Humans and chimps share about 98 percent of their DNA.
29 May 2015, 08:46 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.
28 May 2015, 12:27 AM ET
Few foods are as cool as a cucumber, which is low in calories and high in valuable nutrients.
22 May 2015, 01:31 AM ET
According to the Third Law of Thermodynamics, the entropy of a perfect crystal is zero when the temperature of the crystal is equal to absolute zero (0 Kelvin).
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.