Scientists discover and probe x-rays and radioactivity, while inventors compete to build the first radio.

This investigation has students examining how electric and magnetic charges are related. They will look at how an electric current is affected by the proximity of a magnet.

This comprehensive study guide covers the main terms and concepts needed for an earth science unit on the earth's shape and magnetic field. Review questions are included at the bottom of the study guide.

Compared to incandescent lamps, fluorescent lamps last longer, require less energy and produce less heat, advantages resulting from the different way in which they generate light.

Counting alpha particles was tedious and time-consuming work, until Hans Geiger came up with a device that did the job automatically.

With only minor changes to its original 1866 design, the Leclanche cell evolved into modern alkaline batteries and the most popular household battery to date.

American inventor Vladimir Zworykin, the "father of television," conceived two components key to that invention: the iconoscope and the kinescope.

Many heads, hands and hearts contributed to the development of this lifesaving device.

The man most commonly associated with the telegraph, Samuel Morse, did not invent the communications tool. But he developed it, commercialized it and invented the famous code for it that bears his name.

For thousands of years, electricity was an ephemeral phenomenon- there one second and gone the next. The voltaic pile changed that forever.

What's behind the cool purple sparks? Neat science about resonance and transformers. Slideshow: [6:00]

In the 17th century, German scientist Otto von Guericke built and carried out experiments with a sulfur globe that produced static electricity.

Walter Houser Brattain discovered the photo-effect that occurs at the free surface of a semiconductor and was co-creator of the point-contact transistor, which paved the way for the more advanced types of transistors that eventually...

Gerd Binnig co-developed the scanning tunneling microscope (STM) with Heinrich Rohrer. The STM allowed scientists entry into the atomic world in a new way and was a major advance in the field of nanotechnology. For their achievement,...

In the modern world, virtually everyone is familiar with electricity as an accessible, essential form of energy. In electricity's earlier days, scientists used the buildup and release of static electricity.

Humphry Davy was a pioneer in the field of electrochemistry who used electrolysis to isolate many elements from the compounds in which they occur naturally. Electrolysis is the process by which an electrolyte is altered or decomposed via...