When you are researching your family history and discover differences in details, how do you decide which is right? The key is to be aware that there are two types of records — primary and secondary.

Students will gain skills necessary for researching by locating credible and original sources, determining if the sources are primary or secondary, ascertaining the qualifications and reputation of ...

Primary dysmenorrhea is menstrual pain with no underlying medical cause. Secondary dysmenorrhea is menstrual pain that results from structural abnormalities or medical conditions of the reproductive ...

In this lesson, students learn about the Temperance Movement and New York in the 1890s by watching an excerpt from the Bootlegger’s Notebook, investigation and examining period images, including ...

As the global population expands and industrial activities grow, significant volumes of wastewater are produced, often filled with various contaminants. Image Credit: Bilanol/Shutterstock.com These ...

These pollutants come from various sources, including industrial processes such as petrochemical production, pharmaceuticals, and metal manufacturing, as well as domestic sewage, agricultural runoff, ...