Tibaldo and the Hole in the Calendar cleverly weaves an enjoyable account of the cultural and scientific milieu of 16th century Italy. When Pope Gregory XIII decrees a long-needed calendar reform in 1582, young Tibaldo Bondi loses his birthday. Determined to recover it, quick-witted Tibaldo manages an audience with Pope Gregory and speaks his mind. Beautifully illustrated with drawings that reflect the style of the era, this delightful tale offers a fascinating look at the Renaissance period and will entertain readers of all ages."This delightful tale of a lucky boy is an introduction to the time and place that gave rise to modern science...this book is a delicious, instructive fiction." -SCIENTIFIC AMERICAN"This is a lovely book...it is beautifully produced." -NATURE"This attractive book will make an entertaining and instructive gift for birthday celebrants of any age..." -PHYSICS TODAY