Fifth-grader Alex Trumble builds a "dingus"--a time machine--when his brother Stephen is kidnapped by dangerous, evil time-travelers, to get back to the past and into the future to save his family from disaster.
"With a plot combining science and the supernatural, four kids are caught up in a dangerous plan concocted by the eccentric inventor Nikola Tesla"--Provided by publisher.
Presents an overview of transportation history featuring illustrations and several hands-on projects. Covers inventions such as planes, cars, and trains.
Traces the history to the latest breakthroughs of communications, focusing on the key individuals who revolutionized the technology. Features color illustrations, diagrams, photographs, a timeline, a glossary, and a simple hands-on activity.
Describes how the Jaws of Life tool was invented and then improved upon over the years to help rescue people in life-threatening situations. Includes a glossary of terms and references for further reading.
Examines the origins and history of the telegraph, discussing its invention by Samuel Morse and the inventions that have succeeded the telegraph, such as email. Presents step-by-step instructions for creating a simple telegraph at home.