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The stakes have risen even higher in this third book in the Hourglass series. The Hourglass is a secret organization focused on the study of manipulating time,

Kaleb Ballard was never supposed to be able to see ripples—cracks in time. Are Kaleb’s powers expanding, or is something very wrong? Before Kaleb can find o

A Course in Lens Design is an instruction in the design of image-forming optical systems. It teaches how a satisfactory design can be obtained in a straightforw

It’s mid-summer’s day and thirteen-year-old Elle and her Leapling classmates are visiting the Museum of the Past, the Present and the Future. But on the day

This is the first volume of a monumental work that will provide a complete treatment of all theoretical aspects of reflecting telescope optics. It addresses all