Instead of traditional letter grades, like the ones students get, Ohio uses formulas and a star rating system to grade its school districts.

A generation ago, infectious childhood diseases were nearly wiped out in the U.S., thanks to immunization programs. In the most comprehensive data investigation of its kind, we show how that ...

Error bars illustrate the margin of error for a survey estimate by showing how precise that estimate is. Here are some answers to common questions that might help you better understand charts with ...