Agriculture refers to the practice of cultivating plants, animals, and other forms of life for food, fiber, medicinal plants, and other products used to sustain and enhance human life.

Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time.

The Doppler effect is a scientific phenomenon that occurs when there is a change in the frequency or wavelength of a wave, such as sound or light, due to the relative motion between the source of the wave and the observer.

The Wikipedia page for Electrical Telegraph provides a comprehensive overview of the history, development, and impact of this revolutionary form of long-distance communication.

The Emergency Alert System (EAS) is a national warning system in the United States that enables the President to communicate with the American public during times of emergency.

The Federal Aviation Administration (FAA) is an agency of the United States Department of Transportation.

Helium is a chemical element with the symbol He and atomic number 2.

Hydroelectricity is a form of renewable energy that harnesses the power of flowing or falling water to generate electricity.