Salt is the only rock people eat. The human body needs it to survive. But it does not need much. Your Body on Salt uncovers the nutritional benefits of salt, how it interacts with the body, and how to
In science fiction, time machines let people travel backward in history and forward to the future. How could one of these time-traveling devices be created? Scientists have some ideas, which include u
Today, people use 3D printers to build houses, airplane parts, food, and even living tissue. Inside 3D Printers introduces readers to the uses of 3D printers, the hardware and software that make 3D pr
Today, GPS satellites orbit the earth. They send signals to GPS receivers in cars, smartphones, computers, and drones. Inside GPS introduces readers to the uses of GPS, the hardware and software that
Traces the history of maps, from the oldest known map etched on a clay tablet to a radar image from the space shuttle, and discusses how they have evolved with changes in knowledge, science, culture,
