In the 1870s, Alexander Graham Bell was trying to improve the telegraph when he and his assistant discovered that speech itself could be transmitted over telegraph wires. Explore the subsequent engineering developments that brought the telephone to almost all households, including Bell's invention of twisted-pair cabling to reduce crosstalk, still in use today.

"Since the invention of the telephone, there has been controversy over who really invented it: Was it really Alexander Graham Bell? Or was is Elisha Gray-or someone else? But, the U.S. Supreme Court upheld the first patent issued to a design for a telephone, making Alexander Graham Bell the man credited with changing communication forever! Readers learn about the early life that led Bell to invent the telephone as well as his other accomplishments,...

"Cell phones are an important part of life for many kids and teens. They use cell phones to keep in touch with friends, to look up facts, and for emergencies. But should cell phones be allowed in school? This book introduces readers to major arguments for and against cell phones in the classroom. Readers will be able to take in the arguments and supporting facts to make an informed opinion of their own. Through accessible text, fact boxes, and a graphic...

A cryptic message forces eighteen-year-old American Edda to investigate what secrets followed her across the ocean, even as she tries to make sense of her time as a telephone operator on the French front lines of World War I.

In the old-style analog telephone system, voltage increased and decreased across the wires, corresponding to the human voice signal. But in a digital system, that all changes. Learn how the human voice is changed into binary values, sent over the system, and then converted back into volts with the voltage applied to the speaker in the phone handset. The human ear takes it from there.

From the internationally best-selling author, a chilling fresh spin on the classic horror novel • When the voices call, don't answer.
“In The Night House, the horror begins immediately. And it only keeps calling from there.”—Josh Malerman, New York Times best-selling author of Bird Box and Spin a Black Yarn

In the wake of his parents’ tragic deaths...