The invention of clocks and calendars has been very important in shaping the progress of human civilisation. This book tells their story, from early timekeeping

The Man Who Invented the Calendar provides a taster of the darkly hilarious treasures that can be found in B. J. Novak's One More Thing. We'll meet a vengeance-

Will it be now or will it be later? Use a measuring tool to measure the time. From seconds to years, learn about time and become a measuring master.

Until the nineteenth century all time was local time. On foot or on horseback, it was impossible to travel fast enough to care that noon was a few minutes earli

A comprehensive guide to designing homeschool curriculum, from one of the country’s foremost homeschooling experts—now revised and updated! Homeschooling ca