Students in the United States spend much less time in school than do students in most other industrialized nations, and the school year has been essentially unchanged for more than a century. This is not to say that there is no interest in extending the school year. While there has been little solid evidence that doing so will improve learning…

Coshocton district in Ohio takes part in an unusual experiment that pays students who pass or scores high in the state exams. Pupils here in grades 3 through 6 earn $15 for every "proficient" score and $20 for "accelerated" or "advanced" scores. With annual tests given in five subjects, students can earn up to $100 if…