Long trackways, stone rows, circles, standing stones, and huge earthworks may be found all over Britain, monuments dating back well over 4000 years. The authors

Describes the early 18th-century expedition of scientists sent by France and Spain to colonial Peru to measure the degree of equatorial latitude, which could re

How do you measure the size of the planet you're standing on? "Circumference" is the story of what happened when one man asked himself that very question. Nicho

Night and day, month after month, year after year, our ancestors dutifully recorded the passage of time on clay tablets, watching the heavens from stage towers

A People’s Curriculum for the Earth is a collection of articles, role plays, simulations, stories, poems, and graphics to help breathe life into teaching abou