The pendulum clock was the standard for precise timekeeping for centuries. Plan and build one using your newly acquired knowledge of gears. Start by exploring why a pendulum keeps accurate time. Then calculate an appropriate pendulum length for the clock. Design the escapement mechanism and gear train, then add a suitable power source to keep the pendulum swinging.

Reporting on a range of historical and contemporary female builders and designers, this educational book strives to inspire a new generation of girls in the disciplines of science, technology, engineering, and math. With many of the profiles set against the backdrop of such landmark events as the women's suffrage and civil rights movements and the Industrial Revolution, and with original interviews from a number of current architects and engineers,...

A memoir "for young readers about a Latina rocket scientist whose early life was transformed by joining the Girl Scouts and who currently serves as CEO of the Girl Scouts of the USA"--

Victor Fatherly is a bio-engineer whose work on a new blood regenerator could revolutionize organ transplant work - if his competitor Michael Wooten doesn't beat him to it. Now, someone has stolen both men's inventions. But how? The safe housing Victor's invention is protected by a biometric security system; only Victor's thumbprint and DNA signature can open it. Similarly, Michael's system uses his eye's unique retinal scan as the key. Holmes...

Sixteen-year-old Ariane Tucker has finally escaped GTX, the research facility that created her from human and extraterrestrial DNA. But life on the run is complicated--

George Gearing is the only person that has a robot for a best friend, but when he is hit by a car he gets re-engineered to be a better robot.

"Set in New York and China over three decades, Paper Names explores what it means to be American from three different perspectives. There's Tony, a Chinese-born engineer turned Manhattan doorman, who immigrated to the United States to give his family a better life. His daughter, Tammy, who we meet at age nine and follow through adulthood, and who grapples with the expectations of a first generation American and her own personal desires. Finally, there's...