Every year former White House pastry chef Roland Mesnier makes a gingerbread replica of George Washington's Mount Vernon, but this year he had some special helpers.

The entire fourth grade from Fort Belvoir Elementary School applied STEM disciplines -- science, technology, engineering and math -- to make some extremely accurate replicas of the estate's outbuildings.

Chef Mesnier's Mansion plus the students' buildings can be seen on display at Mount Vernon's Reynolds Center throughout the holiday season. Less