Grade 5 Science and Tech Development: Communication

Discover the inventions that changed the way people communicate throughout history. A thousand years ago, communicating quickly and efficiently to a large audience or over a long distance was a dream. Since then, inventions such as telephones, the printing press, computers, televisions, radios, cell phones, and the Internet have emerged and the functions of communication changed forever.

Cell phones have changed the way people live, work, and communicate with each other. Since the first handheld phone was created in 1973, cell phones have only increased in popularity. ""How Do Cell Phones Work?"" delves into the science behind cell phones and the reasons for their popularity, from their portability to unique features, with full-color photographs and illustrations.

ses humor in both text and illustrations to describe what it would be like to live without the cell phone and describes how people managed to communicate in the past.

In recent years, the number of teens with smartphones has exploded. While this greater access to mobile technology has its advantages, it also holds potential dangers. Smartphones pose a surprising number of threats to teen health and safety, including distracted driving and walking, sexting and sextortion, cyberbullying, identity theft, and broadcasting one's location to strangers. Overuse can lead to problems such as smartphone addiction and sleep deprivation, and physical ills like "BlackBerry thumb" and "text neck." Using many real-life examples, the author makes teens aware of these and other problems and gives practical guidelines for preventing them.