Rice production is heavily dependent on nitrogen fertilizers, particularly in China, where application rates are two to three times the global average. At the same time, a large amount of nitrogen is ...

The new question-of-the-week is: What are good ways to have students learn about—and use—primary sources? Primary sources can be great tools to inspire students to engage with history. They can also ...

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 ...

Radioactive sources contain radioactive material of a particular radionuclide (an unstable form of an element emitting radiation), which can vary based on the application for which the source was ...