James S. McDonnell

(Courtesy Mary Institute and St. Louis Country Day School)

A St. Louis County private school has received a $21.5 million donation from the James S. McDonnell family.

Mary Institute and St. Louis Country Day School, or MICDS, will use the money to build a new, 52,000 square-foot science and math facility.

MICDS head of school, Lisa Lyle, says the goal is to involve students in the process of scientific research.